Smail Layes

Robert Lalonde

Mohamed Rebaï

Study on Morphological Awareness and Rapid Automatized Naming Through Word Reading and Comprehension in Normal and Disabled Reading Arabic-Speaking Children

Keywords: Reading disability, word recognition, reading comprehension, morphological awareness, rapid automatized naming

HAL is

Introduction

Morphological awareness (MA) and rapid automatized naming (RAN) deficits represent the best elements distinguishing dyslexic from non-dyslexic children at age 7, considered strong correlates of developmental dyslexia (Hua Shu & Hong Li, 2012). MA acknowledged as an important factor in word reading across alphabetic languages [START_REF] Carlisle | Morphological awareness and early reading achievement[END_REF][START_REF] Carlisle | Effects of instruction morphological awareness on literacy achievement: An integrative review[END_REF][START_REF] Mcbride-Chang | Morphological awareness uniquely predicts young children's Chinese character recognition[END_REF]Wagner et al., 1997). However, its importance is thought to vary across orthographies [START_REF] Deacon | Cross-over: The role of morphological awareness in French immersion children's reading[END_REF]. Although evidence accumulated in the last few years converges on the importance of MA in learning to read in Arabic (e.g., [START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF][START_REF] Saiegh-Haddad | Morphological awareness, phonological awareness, and reading in English-Arabic bilingual children[END_REF], its functioning in regard to RAN has not yet been delineated [START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF]. Little is known about RAN and reading comprehension (RC) among Arabic children (Abu-Rabia , Share & Mansour, 2003;Abu-Rabia & Awad, 2004). The purpose of this study was to explore the relationship between MA, RAN, and RC as well as the respective role of MA and RAN as predictors in word recognition and RC among normal and dyslexic Arabic speakers.

The interplay among morphological awareness, word reading and reading comprehension

MA, the ability to reflect on and manipulate the smaller meaningful units that form words [START_REF] Kuo | Morphological Awareness and Learning to Read: A Cross Language perspective[END_REF], is a basic skill with a strong influence on reading processes [START_REF] Casalis | Morphological analysis, phonological analysis and learning to read French: A longitudinal study[END_REF]. MA involves the ability to identify word roots and their inflected or derived forms to understand the structure and meaning of a word and the different combinations of its morphemes. Accordingly, it refers to a conscious awareness of word structure and semantics while processing inflectional and derivational representations [START_REF] Kieffer | The role of derivational morphological awareness in the reading comprehension of Spanish-speaking English language learners[END_REF]. It represents one of the best discriminators of children with or without dyslexia (Shu, McBride-Chang, Wu & Liu, 2006) and contributes to a variety of literacy skills [START_REF] Green | Morphology and literacy: Getting our heads in the game[END_REF].

Many researchers point out that MA is related to children's RC [START_REF] Carlisle | Morphological awareness and early reading achievement[END_REF][START_REF] Carlisle | Awareness of the structure and meaning of morphologically complex words: Impact on reading[END_REF][START_REF] Kuo | Morphological Awareness and Learning to Read: A Cross Language perspective[END_REF][START_REF] Mahony | Reading ability and sensitivity to morphological relations[END_REF] at different grade levels [START_REF] Carlisle | Lexical processing of morphologically complex words in the elementary years[END_REF] as a function of exposure to unfamiliar words [START_REF] Kuo | Morphological Awareness and Learning to Read: A Cross Language perspective[END_REF]. [START_REF] Carlisle | Awareness of the structure and meaning of morphologically complex words: Impact on reading[END_REF] showed that the awareness of morphological structures was significant for grade 2 children and stronger for higher grades. In a longitudinal study of French-speaking children, [START_REF] Casalis | Morphological analysis, phonological analysis and learning to read French: A longitudinal study[END_REF] found that MA accounted for variance in RC after controlling for IQ and vocabulary. Furthermore, [START_REF] Kieffer | The role of derivational morphological awareness in the reading comprehension of Spanish-speaking English language learners[END_REF] showed that awareness of derivational morphology played an increasingly important role in RC.

Researchers have argued that the contribution of MA to RC occurs via several possible paths [START_REF] Deacon | Morphological awareness: Just "more phonological"? The role of morphological and phonological awareness in reading development[END_REF][START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF]. It may happen depending on indirect mechanisms by facilitating the development of a wide vocabulary, which in turn promotes successful RC as well as in the accurate and rapid reading of words, which may release attentional resources for comprehension and enables individuals to analyze the internal structure of words and decode them more quickly and accurately. A second possible way follows straight mechanisms in making a direct involvement in the reading process by facilitating the extraction of semantic information from morphologically complex words.

Findings from Arabic studies [START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF] indicate that dyslexic readers rely on roots as well as short vowelization in reading to compensate for poor phonological decoding through reliance on a root identification strategy. The most significant differences between reading disabled children in grade 5 and control groups matched by chronological age and reading level were found in morphological tasks (Abu-Rabia, Share, & Mansour, 2003;[START_REF] Ben-Dror | Orthographic representation and phonemic segmentation in skilled readers: A cross-language comparison[END_REF]. These findings enhance the argument that Arabic readers rely on roots of words as key morphological entities to the initial lexical access in reading. Taken together, the empirical evidence of studies reviewed above indicates that the importance of MA to decoding and RC increases with age and contributes to RC [START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF].

The varying role of morphological awareness in reading across orthographies

Many researchers have acknowledged the multiple roles of MA in reading words and RC [START_REF] Georgiou | Predictors of word decoding and reading fluency across languages varying in orthographic consistency[END_REF][START_REF] Lei | Developmental trajectories of reading development and impairment from ages 3 to 8 years in Chinese children[END_REF]Tong, Deacon, Kirby, Cain, Parrila, 2011) and there is increasing evidence that the impact of morphology deficits in reading disability manifests itself differently across orthographies. [START_REF] Nagy | Relationship of morphology and other language skills to literacy skills in at-risk second-grade readers and at-risk fourth-grade writers[END_REF] found varying roles of morphology in RC, which may be due to differences in the orthographies studied. Accordingly, it has been suggested that the relevance of MA to reading depends on "morphological transparency", the relative degree to which the phonological structure of written words may be reliably recovered from their morphological structure [START_REF] Saiegh-Haddad | Morphological awareness, phonological awareness, and reading in English-Arabic bilingual children[END_REF]. Thus, MA should be more relevant to reading in a language with a linear transparent morphological structure such as English than in a language with a non-linear one such as Arabic.

Researchers argue that the morphology of the language plays an essential role in reading Arabic and Hebrew [START_REF] Abu-Rabia | The role of vowels in reading Semitic scripts: Data from Arabic and Hebrew[END_REF]Abu-Rabia et al., 2003;Prunet, Béland, & Idrissi, 2000;Shimron, 1999).

Arabic morphology is mainly derivational, while others are concatenative. In derivational morphology, almost all words are derived from roots by applying patterns [START_REF] Al-Sughaiyer | Arabic Morphological Analysis Techniques: A Comprehensive Survey[END_REF]. The words are based on phonological patterns built on roots that are consonantal.

The root is usually made of three consonants and carries the core meaning of the words derived from it. For example, the word / jalis / ("seated") is made of the root consonants {s, t, d}, which bears the meaning of "posture" and the pattern {CaaCiC} represents the active voice. Thus, derived Arabic words are composed of two abstract morphemes, the consonantal root, and the pattern, which results in words only after their combination and may involve the application of phonological rules. Therefore, Arabic can be considered as predominantly based on consonantal roots.

In contrast to the derivational process in which the basic components are roots and word patterns, the inflectional morphological system in Arabic is constructed by attaching prefixes and suffixes to words. Various vowels, prefixes, and suffixes are used with the root letters to create the desired inflection of meaning. Although Arabic morphology is not transparent in a non-vowelized form (i.e., short vowel diacritics), readers are likely to rely on visual recognition of the root and the pattern to support word recognition and the determination of meaning. The combination of morphological units in Arabic is not linear such that it relies on interlacing between the root and the word pattern which can be built of prefixes, suffixes, and infixes and intertwining with the root can affect the order of the root letters [START_REF] Feldman | Morphological analysis of disrupted morphemes: Evidence from Hebrew[END_REF]. Therefore, the order of root letters depends on the word pattern and its interaction with the root for given grammatical information expressions. Example of constructing an Arabic word stem using the root and scheme: Root: ب/ ت /ك "ktb" Scheme: / /ﺗﻔﺎﻋﻞ "tafaala" Stem: "takataba" / /ﺗﻜﺎﺗﺐ

The role of rapid automatized naming in word recognition and reading comprehension

RAN represents one of the most powerful predictors in the reading ability of children across orthographies, both in transparent [START_REF] Brizzolara | Do phonologic and rapid automatized naming deficits differentially affect dyslexic children with and without a history of language delay? A study of Italian dyslexic children[END_REF][START_REF] Mann | Phoneme awareness and pathways into literacy: A comparison of German and American children[END_REF] and opaque [START_REF] Parrila | Articulation rate, naming speed, verbal short-term memory, and phonological awareness: Longitudinal predictors of early reading development[END_REF][START_REF] Roman | Toward a comprehensive view of the skills involved in word reading in Grades 4, 6, and 8[END_REF] orthographies. In different languages, RAN was a significant predictor of reading in typically developing and reading-impaired populations (e.g. [START_REF] Georgiou | Comparing the contribution of two tasks of working memory to reading in relation to phonological awareness and rapid naming speed[END_REF][START_REF] Georgiou | Predictors of word decoding and reading fluency across languages varying in orthographic consistency[END_REF][START_REF] Furnes | Predicting reading and spelling difficulties in transparent and opaque orthographies: A comparison between Scandinavian and U.S./Australian children[END_REF]Vaessen et al. 2010). More importantly, the strength of prediction of RAN varies in regard to the depth of language orthography (Vaessen et al., 2010). However, the prediction pattern of RAN showed divergent findings in Arabic based studies. [START_REF] Saiegh-Haddad | Correlates of reading fluency in Arabic: Diglossic and orthographic factors[END_REF] demonstrated that although RAN was significantly associated with all literacy measures in grade 2 children, it failed to predict variability in literacy independently of phonological awareness (PA). More recently, rapid naming (measured by the Stroop test) did not appear as an independent predictor [START_REF] Al Mannai | Ponological processing skills as preditors of literacy amongst Arabic speaking Bahraini children[END_REF], diverging from findings in other transparent orthographies (i.e. German). Such controversy among Arabic based studies may be related to the nature of the instrument by which RAN is measured.

RAN assessed by three different tasks predicted word reading in the 4 th and 5 th grades of dyslexic and normal readers (Layes et al., 2015b à vérifier est-ce OK ?). RAN was more closely associated with reading fluency, whereas the phonological measure was linked to accuracy and comprehension, supporting recent findings reported by Wolff (2014), who demonstrated that RAN predicts reading speed whereas PA predicts RC in examining longitudinal data from a reading intervention study carried out for 9-year-old children with reading difficulties.

In sum, performance on RAN tasks (objects, letters, digits) have been shown to be strongly correlated with RC [START_REF] Powell | An experimental comparison between rival theories of rapid automatized naming performance and its relationship to reading[END_REF] and it is thought to facilitate RC because it releases resources for meaning in the comprehension process (Verhoeven & Perfetti, 2008). However, it is hard to find any Arabic study that has explicitly investigated multivariate relationships by which direct contributions of MA and RAN are assessed on word recognition and RC, though Arabic is a morphologically based orthography.

Review of the Arabic based literature

Previous Arabic based studies (Abu Rabia, 2003[START_REF] Abu-Rabia | The role of morphology and short vowelization in reading Arabic among normal and dyslexic readers in Grades 3, 6, 9, and 12[END_REF][START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF] showed that morphology, via identification and production tasks, was the most powerful predictor of both reading accuracy and RC among dyslexic and normal readers across grades 3, 6, 9, and 12. The dyslexics and the two control groups (matched for age and reading level) performed better on vowelized compared to unvowelized reading measures except for morphology [START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF]. It seems that full vowelization played a facilitating role in reading achievement and therefore an unvowelized version of stimuli (absence of diacritics) would make it more difficult. Furthermore, findings of [START_REF] Abu-Rabia | The role of morphology and short vowellisation in reading morphological complex words in Arabic: Evidence for the domination of the morpheme/root-based theory in reading Arabic[END_REF] show varied effects of full vowelization on pseudo-words and reading tasks.

Accordingly, it seems appropriate to investigate the role of morphology in a neutral phonological condition where consonants are partially vowelized. Consistent with this aim, the present research focused on partially vowelized items.

Conversely, recent findings provided by Taha (2013) showed that there is no significant correlation between MA and the processes of reading and decoding. This may be related to the nature of the morphological test relying on the deduction of semantic relations between words rather than pure MA. This lack in the sensitivity of the tests used may have led to assessing MA performance inadequately. We proposed five morphological tasks, including recognition, judgment of relatedness, and production skills. Additionally, it is hard to find in the Arabic literature a study in which RC was studied along with MA and RAN. In [START_REF] Mahfoudhi | The Role of Morphological Awareness in Reading Comprehension Among Typical and Learning Disabled Native Arabic Speakers[END_REF], besides MA and RAN, RC studied among children with literacy and mathematics learning difficulties (LD) was limited to the measurement of speed of implementation (fluency).

More recently, MA and RAN were associated with reading accuracy (Taha, 2013).

The specific issue addressed in this study was to determine whether there is an influence of MA and RAN on reading words and RC of dyslexic as well as age-matched and younger normal readers in grade 4. Comparisons between dyslexics and age-matched controls are of great interest to identify the diagnosis-specific characteristics of children with dyslexia as well as identifying factors underlying poor reading. Furthermore, the discrepancy by grade in reading-related skills by comparisons with younger children (grade 4) is relevant to reading development. Differential performance patterns, according to which the dyslexic group show deficits relative to a younger group on some measures would indicate that disabled readers are not just slow developers but have special characteristics.

The present study

It is argued that in alphabetic languages, MA was the best predictor of reading accuracy and RAN of reading speed [START_REF] Kirby | Children's morphological awareness and reading ability[END_REF]Snowling & Hulme , 2012). Studies suggested that morphological processing has a great importance regarding controlling processes in reading Arabic orthography [START_REF] Abu-Rabia | The role of morphology and short vowelization in reading Arabic among normal and dyslexic readers in Grades 3, 6, 9, and 12[END_REF]Abu-Rabia & Taha, 2005;Taha, 2013;Taha, Ibrahim, & Khateb, 2013). Accordingly, it is important to investigate the contribution of different cognitive and metalinguistic skills in reading Arabic among typical and poor readers, due to the morphological richness of the Arabic language, and to examine the best predictors in reading efficiency, particularly in RC, which may contribute in the elaboration of assessment tools for Arabic children, as previous studies suggest that MA should be a more standard component of early assessment batteries [START_REF] Bowers | The effects of morphological instruction on literacy skills: A systematic review of the literature[END_REF][START_REF] Nunes | Improving literacy by teaching morphemes[END_REF].

Arabic disabled readers may be able to rely on phonological information provided by voyelisation signs (diacritics) to overcoming morphological processing difficulties. This reliance on phonological information may differ in the two reading tasks, namely word decoding and RC.

Because of the relationship between phonological processing and MA detailed in the literature, these two areas of processing were contrasted to ensure that any influence of MA was not due to its relationship with phonological processing and the latter's influence on RC. The present study examined the relationships between MA and RAN as independent variables as well as word recognition and RC and the respective contributions of each to the prediction of reading words and comprehension among typically developing and dyslexic Arabic children in the 4 th and 6 th primary grades.

Based on issues raised above, the questions that the present study aims to answer are specified as follows: a) -How do dyslexic children compared to controls perform on RC, MA, and RAN as main related reading skills? b) -Is there a significant group effect (dyslexics vs. normal readers) and/or grade effect (4 th vs. 6 th grade) on RC, MA, and RAN? b) -What is the extent of the prediction pattern of word recognition and RC from these readingrelated variables (MA and RAN)?

It was anticipated that the dyslexic group would perform less well than age-matched control and younger groups in basic reading tasks (phonological processing measured by pseudoword identification and word recognition), RC, RAN and MA. These differences would also be exhibited between normal readers of 4 th and 6 th grades after controlling for the group variable, and therefore, would indicate for each factor a unique contribution to reading words and RC.

Given the level of morphemic consistency and the apparent importance of morphemes (outlined above) in the Arabic language, MA was expected to have a strong influence on reading Arabic and, hence, explains variability in word recognition and RC. Since RAN was a powerful predictor in several transparent orthographies, we expected RAN to be strongly related to RC and word reading in Arabic speaking children.

Method

Participants

Three groups of readers were screened in their school. In total, 40 students from grade 6 were diagnosed on the basis of their performance on a literacy test (Layes et al.,2015a,b je crois que c'est ceci et non 2014, 2015). The dyslexic group (n=20) was composed of 6 females and 14 males, their mean chronological age was 133.60 months (SD = 8.37). As additional criterion for the group of dyslexics was their performance on general ability showing adequate performance on the Raven Standardized Matrices test compared to controls (Table 1). The age-matched group (n=20) was composed of 5 females and 15 males and their mean age in months 130.09 (SD = 3.99). However, the initial number of age-matched control (AC) group (n= 23) was reduced after removing outlier scores. A younger normal reader group (n= 18) was included from grade 4, their mean age being 116.83months (SD = 5.12). This group was included as a reading level control planned in three groups (dyslexics, aged matched and reading level matched groups). However, unpredictably we got a normal reader group younger than the dyslexic group (-2 years) but with a higher reading level (significantly superior reading scores), so a reading matched controlling factor was not conductible. However, we maintained data of this younger reader group to investigate potential differences within normal readers differentiated according to grade (grade 4 vs. grade 6), which would indicate a significant role of age/instruction in related reading skills.

Materials and procedure

Literacy tasks

This test was elaborated beforehand for the purpose of reading assessment skills in children

-Frequent word reading

The stimuli consisted of two lists of 40 words: 20 simple words and 20 complex words.

According to their internal graphemic structure, words were considered to be simple and complex depending on whether letters were totally or partially legated (graphically connected).

-Infrequent word reading Two lists of 40 words included 20 simple words and 20 complex words, based on the same characteristics as the previous task. The score of total words read was defined as reading frequent words and infrequent words.

Phonological processing: Pseudo words identification task (α = .83).

Pseudo-word identification is a trustworthy measure of phonological coding and graphemeto-phoneme decoding skills [START_REF] Pugh | The relationship between phonological and auditory processing and brain organization in beginning readers[END_REF] and represents the most commonly used task in transparent systems (Abu Rabia & Abu-Rahmoun, 2012;[START_REF] Jiménez | Identifying subtypes of reading disability in the Spanish language[END_REF]. This task consisted of a list of 20 partial vowelized pseudo-words varied for orthographic length (CVCV /CVCVC). Items were not rooted from Arabic real words which may introduce a frequency effect in the identification performance (Layes et al, in preparation) .

Reading Comprehension

This test is an adapted version of a reading comprehension subtest labeled "sentence comprehension" of Khomsi's LMC-R test (1999), composed of 15 items. The sentences were in some way designed in ascending order of syntactic difficulty (structural length). Reading comprehension includes sentences along with pictures. Children silently read a sentence and selected the target picture from four choices best representing the sentence without limitation of time. The other pictures were distracters that included only some information of the sentence. This reliance on pictures as a source for extracting meaning parallels RC instructions received at primary school. In this context, it should be noticed that the use of oral questions (rather than pictures) involves an additional linguistic load, with may constrain reading comprehension in poor reading children, known to have poor listening comprehension [START_REF] Nation | Children's reading comprehension difficulties[END_REF], regarding the strong relationship between written and spoken language comprehension. In addition, using a longer connected text may involve supplementary cognitive skills, particularly working memory, weak in dyslexics. Hence, we should consider that our reading comprehension assessment uses short sentences, without demanding much working memory relative to reading passages or paragraphs.

That condition might have facilitated dyslexic performance, and we think that in longer texts, the overload of working memory can impair their RC measures.

Morphological Awareness test

This measure was adapted from an Arabic MA version elaborated by Taha and Saiegh-Haddad (submitted), which assesses a child's implicit morphological awareness knowledge. All words were partially vowelized (phonologically transparent). We paid attention (for all subtests) that the selected words are known to children. A score of (0) was given for incorrect or partially correct responses and (1) for correct responses. The students were given two practice items before the task was initiated. The examiner recorded whether each item was correct or incorrect. The score was the number of correct responses. For this study, the alpha reliability was .78. The internal consistency reliability coefficient was adequate (Alpha Cronbach = .86).

It consisted of five tasks:

-Morphological Judgment Relationship task

The purpose of this subtest was to evaluate the knowledge of (derivational) morphology which refers to the child's ability to recognize the morphological relationship (relational knowledge) between words. Pairs of words related either morphologically (e.g. 3amal [work] /3amel/ [worker]) or semantically (e.g. mahkama [tribunal] / 3adala [justice]) were presented to the children, who decided whether the two words belonged or not to the same morphological family. This type of task is widespread in morphological awareness assessment [START_REF] Mahony | Reading ability and sensitivity to morphological relations[END_REF][START_REF] Nagy | Relationship of morphology and other language skills to literacy skills in at-risk second-grade readers and at-risk fourth-grade writers[END_REF][START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF].

A set of 20 word pairs of words was used, frequent in stem and derived forms. The examiner presented 20 pairs orally one by one. The child was given these instructions: You will hear pairs of words that sound alike. Listen carefully and tell me whether the words that I say are from the same family or not." The child responded yes if the word pair was morphologically related and no if the word pair was morphologically unrelated. Some of the pairs were semantically but not morphologically related, which might provide an ambiguous sight for the examinee. Two pairs of high-frequency words, of stem or derived form, were presented as practice items. Two additional trials were provided if the child experienced difficulty understanding the task.

-

Morphological Production task

This task was conceived to examine the participants' ability to generate a number of words morphologically related to the original given one's route. Ten words (verbs) partially vowelized were presented to the participant instructed to generate four derived forms for each word in five minutes. Because of the time limit, each participant was solicited to perform as fast as possible.

The expected responses follow various patterns commonly used in Arabic: agentive (e.g., ka:teb -Morphological Dismantling task This task measures the students' ability to analyze and break down complex words into smaller meanings. It is composed of 14 items. Participants were instructed to hear the items one at a time and segment them into meaningful parts, as many smaller meanings as they could identify in each item. It is worth noting that the instructions were followed directly with an example to illustrate what they should do with each item.

-Decision in accordance with the Ortho morphological format task A list of four words in each sequence and frequent in stem and derived forms was used. They share the same pattern except one: agentive (e.g., ka:teb [writer]), passive adjective (e.g., maktu:b

[written]), place adverbial (e.g., maktab [office]), and reciprocal verbal (e.g., ka:taba [wrote]) [START_REF] Saiegh-Haddad | Morphological awareness, phonological awareness, and reading in English-Arabic bilingual children[END_REF]. Participants were instructed as follows: after reading every set of words, underline the word that is different from the rest of the words in terms of shape (pattern).

Statistical analyses

Multiple analysis of covariance (MANCOVA) was used to test group differences on all measures. Due to unexpected inequality in the IQ of the three groups as well as reading level between reading-disabled and younger normal readers at grade 4, the MANCOVA was conducted to test whether those differences remained after controlling for differences in IQ, age, and reading level (Abu rabia, Share and Mansour, 2003). To address our second aim corresponding to locate the source of variance, the Boneforri post hoc test was used. Furthermore, two separate hierarchical regression analyses were conducted to locate the most powerful predictors of both word reading and reading comprehension achievement for the entire sample.

Results

We examined whether RC, MA, and RAN distinguishes dyslexics from age-matched peers and normal younger readers and to inspect the extent to which MA and RAN as independent variables are related to word reading and RC. The Kolmogorov-Smirnov test of normality (as well as Shapiro-Wilk test) showed no significant values for RC, MA, and RAN for the two reader groups, in addition to the RC and IQ (all values > .05), indicating no violation of the assumption of normality. Although the homogeneity of variance assumption was not violated regarding Leven's test in total basic reading skill and MA, there were significant values for RC and RAN. However, a a between-subject ANOVA with an almost equal numbers of participants contributing to the mean does not usually lead to increasing chances of drawing false conclusions (Zar, 1996), especially when the skew for each means is in the same direction for each group.

Descriptive data by group, means and, standard deviations for each measure are shown in Table 1, presenting ANOVAs of the three groups on word recognition and RC, MA, and RAN.

The results on Raven's standard progressive matrices indicate that the dyslexic group (grade 6) and the age-matched control were at the same level but higher than younger's mean IQ, likely due to the age difference between the two grades. D'après le tableau les dyslexiques sont equivalents aux jeunes et non aux vieux. La phrase serait alors : The results on Raven's standard progressive matrices indicate that the dyslexic group (grade 6) and the younger control were at the same level but higher than age-matched controls. As predicted, the children with dyslexia were impaired in basic literacy tasks, RC, total MA score, and total RAN score. In particular, children with dyslexia had lower values in five measures of MA and RAN (Object) tasks than both age-matched controls and younger readers. The word recognition results indicated significant differences between the three groups, while the reading-disabled generally performed less well than the other two non-dyslexic reading groups. The RC results mirrored the word recognition results. However, the unexpected differences in reading level between the reading-disabled and younger normal readers (grade 4) are treated statistically in the next section.

The main effects of "Group" and "Grade"

Two separate one-way multivariate analyses of covariance (MANCOVA) of the three grouped (dependent) variables (RC, MA and RAN) were implemented, alternatively for "grade" (4 th versus 6 th normal readers) and "group" (dyslexic versus controls) as fixed factors, and controlling for nonverbal ability and age. When the "grade" variable is entered as a fixed factor, "group" variable is entered as covariate. Variance-covariance matrices were compared between groups with Box's M-test giving a significant value, indicating that the homogeneity of covariance has not been met, so that Pillai's trace was taken as more robust to this violation instead Wilk's

Insert table.1

lambda and we can ignore this assumption when group sizes are almost equal [START_REF] Leech | IBM SPSS for Intermediate Statistics: Use and Interpretation[END_REF]. To go farther in the analysis, we performed a MANCOVA for MA and RAN separately taking subtests of each measure as dependent variables.

Group effects

MANCOVA with RC, MA and RAN as dependent variables and GROUP as the fixed factor was run. The omnibus effect for Group was significant (Pillai's =.293, F (3.51) = 7.04, p < 0.000), partial eta squared = .293. Power to detect the effect was .972. Given the significance of the overall test, the univariate main effects were examined. Significant main effects on ANOVA were obtained for Reading Comprehension, F (1.53) = 15.934, p <.000 , partial eta square =.231, power = .795 , MA, F (1.53) = 14.522, p <.000 , partial eta square =.215, power = .963, and RAN, F

(1.53) =9.337 , p <.004 , partial eta square = .150, power = .851.

Multivariate analysis of covariance for the MA tasks was implemented with GROUP as the fixed factor and controlling for nonverbal ability and grade level. Box's M-test of equality of covariance indicated that the homogeneity of covariance has not been met (20.22> .05). The omnibus effect for group was significant (Wilks'λ= .675, F (5.49) = 4.72, p < 0.001), partial eta squared = .325. Power to detect the effect was .963. Given the significance of the overall test, univariate main effects were examined. Significant univariate main effects were obtained for two of the five subtests: Morphological Production, F (1.53) =14.18, p <.000, partial eta square =.211, power = .959; and Pattern Recognition, F (1.53) =11.47, p <.001, partial eta square =.178, power = .914. Additionally, multivariate analyses of covariance for RAN subtests were performed with GROUP as the fixed factor and controlling for nonverbal ability and grade. Box's M-test of equality of covariance indicated that the homogeneity of covariance has not been met (10.98> .05).

The omnibus effect for group was significant (Wilks'λ= .818, F (3.51) = 3.79, p < 0.01), partial eta squared = .182. Power to detect the effect was .785. Given the significance of the overall test, the univariate main effects were examined. Significant univariate main effect was obtained for one among the three subtests: RAN Objects, F (1.53) =10.60, p <.002, partial eta square =.167, power = .892.

Insert figure 1

Grade level effects MANCOVA with grade level as the fixed factor was replicated for RC, MA and RAN as dependent variables and GRADE as the fixed factor. The omnibus effect for Grade was significant (Pillai's =.239, F (3.52) = 5.44, p < 0.002), partial eta squared = .239. The observed power to detect the effect was .920. Given the significance of the overall test, univariate main effects were examined. Significant ANOVAs main effects were obtained for RC, F (1.54) = 2.095, p >.05, MA F

(1.54) = 5.687, p <.05, partial eta square =.095, power = .649, and RAN, F (1.54) =1.427, p >.05.

MANCOVA with "Grade level" as the fixed factor was replicated for MA tasks. Box's M-test indicated heterogeneity of covariance (18.86 > .05). The omnibus effect was significant (Wilks'λ= .710, F (5.49) = 3.99, p < 0.004), partial eta squared = .290. Power to detect the effect was .925.

Significant univariate main effects were obtained for the same subtests cited above: Morphological Production, F (1.53) =8.52, p <.005, partial eta square =.138, power = .817; and Pattern Recognition,

F (1.53) =7
.27, p <.009, partial eta square =.121, power = .754. Box's M-test of equality of covariance also indicated indicated heterogeneity of covariance for the three RAN substasks (9.75> .05). The omnibus effect for Grade level was not significant (Wilks'λ= .981, F (3.51) = 0.32, p > 0.05). Subsequently, no significant univariate main effects were obtained.

As demonstrated in the MANCOVA outputs for RC, MA and RAN, there were significant effects of group and grade variables.

Correlations and hierarchical regression analyses

To examine the relationship between literacy, RC, RAN, and MA, intercorrelations are shown among all measures after partialling out the effects of age and IQ in Table 2 for each group of readers. A dissimilar profile was displayed for the two cohorts. In the dyslexic group, word reading was not associated with RC , MA, or RAN. In the normal reader group, word reading reading was strongly correlated with RC (p< .01) and RAN (p< .000). Pseudo-word identification correlated with all measures (p< .05) only in the normal group only. RC and MA were significantly associated (p< .01) as well in both groups of readers, but no correlation was found between RC and RAN.

In summary, the analysis suggests that efficiency for both word recognition and RC relies mainly on phonological processing and MA in the normal development of reading skills.

Insert table 2

Hierarchical multiple regressions were performed on combined data from the three groups to examine the extent to which phonological processing, MA, and RAN explained variability in word reading and RC. The control variables for age and IQ were entered as the first block into each regression analysis. The meta-linguistic measures were entered with phonological processing first because it is best established as a strong correlate of reading skills. RAN and MA were second and third because they have been shown to be less strongly related to literacy (e.g., McBride-Chang et al, 2010), and finally RC was taken as an independent variable for word reading outcome and vice versa. MA and RAN, and phonological processing were then entered in the second, third and fourth blocks, respectively.

As shown in Table 3, regression analysis indicates that two of the four variables explained word reading ability: age and IQ (R 2 = 0.20); pseudo-word identification variance explained = 0.19. However, RC as the dependent variable was moderately to strongly predicted by all independent variables: age and IQ (R 2 = 0.44), pseudo-word identification (R 2 = 0.10), RAN (R 2 = 0.14), and MA (R 2 = 0.06). Overall, the four metalinguistic skills were more associated with RC than word reading.

Discussion

As expected, significant differences appeared between dyslexics and two normal reader groups on word reading, RC, MA, and RAN. Post-hoc comparison in MA showed that on average age-matched controls performed better than dyslexics and younger readers, who were comparable with dyslexics; however, in the RAN test, although dyslexics were poorer than age-matched controls, they performed equally with younger controls. The significant differences between normal reader groups and dyslexics in the two morphological tasks demonstrate the importance of morphological knowledge on reading skills, which may increase as reading experience evolves [START_REF] Carlisle | Awareness of the structure and meaning of morphologically complex words: Impact on reading[END_REF][START_REF] Mahony | Reading ability and sensitivity to morphological relations[END_REF]. These results are comparable with those showing impairments in reading comprehension among Arabic dyslexics (Abou rabia, 2002(Abou rabia, , 2007;;[START_REF] Mahfoudhi | The Role of Morphological Awareness in Reading Comprehension Among Typical and Learning Disabled Native Arabic Speakers[END_REF][START_REF] Saiegh-Haddad | Morphological awareness, phonological awareness, and reading in English-Arabic bilingual children[END_REF], suggesting that children with dyslexia have difficulty in decoding the written words that affect comprehension.

Insert table 3

Dyslexic children had lower scores on two of five MA tasks, namely Morphological Production and Pattern Recognition, leading to significant difference in the total score of MA between groups.

A similar result was reported by Abu-Rabia et al (2003), where the performance of the readingdisabled children in morphological tests (Morphological relatedness and Morphological derivation)

was significantly poorer than that of the other groups (age-matched and younger readers groups).

Similar findings have also been presented in Hebrew [START_REF] Ben-Dror | Orthographic representation and phonemic segmentation in skilled readers: A cross-language comparison[END_REF], demonstrating that morphology is a key variable in reading Semitic languages. During reading, MA may facilitate the accurate recognition of words in sentences [START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF]. If individuals are more readily able to recognize word parts, they are likely to recognize both the word and its meaning, since morphemes represent both orthography and meaning. Such status is more acknowledged in Arabic as non-concatenative language, which uses both linear and non-linear morphological processes and employs two types of bound morphemes: a consonantal root, which carries the semantic core (meaning) of the word (e.g., KTB) and a word pattern or vowel template, which, together with the consonantal root, form a word (e.g., KaTaBa) (to write). These characteristics add to the challenge of learning to read in Arabic.

Our findings demonstrating a strong relation between decoding (words and pseudo-words)

and RC in the non-dyslexic cohort, but not in the dyslexic one, are in agreement with previous ones, indicating that MA may contribute to text comprehension by supporting the interpretation of unknown words [START_REF] Carlisle | Awareness of the structure and meaning of morphologically complex words: Impact on reading[END_REF][START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF]. This complies with the "Simple View of

Reading" (SVR) [START_REF] Gough | Decoding, reading, and reading disability[END_REF]Hoover & Gough, 1990), which suggests that RC results from developing skills in the areas of decoding and linguistic comprehension, and hence contributes significantly to reading skills in young children (de Jong & Van der Leij, 2002).

However, RC can be impaired when only one of the two abilities is poor. The strong correlation between MA and RC in both groups of readers may be described in the framework of the SVR model. That is to say, all subtasks in our MA test require oral language comprehension, as instructions and items were orally presented to participants. This might explain why MA serves as a predictor of RC but not in word reading.

Dyslexic readers with difficulties in MA are likely to have difficulties in identifying and discriminating morphemes, manipulating the morphemic structure, and generalizing morpheme meaning. They may be unaware of the role of roots and flexional derivational relations. Thus, poor MA may unable dyslexics to form clear semantic representations of morphemes which could lead to a potential problem in reading development. In addition, results showed that word recognition, pseudo-word pseudo-word identification, and RC were significantly correlated with MA and RAN in typical readers, findings consistent with previous ones conducted in relatively transparent orthographies and children of comparable age, indicating that rapid naming is associated with reading skills across ages (e.g., [START_REF] Kirby | Naming speed and reading: From prediction to instruction[END_REF]Vaessen & Blomert, 2010). RAN appears to be related to word reading, as both tasks require serial processing and activation of naming processes. However, RAN seems to be more related to RC (reading sentences) than word reading, underlying the probable major role of semantic processing speed (serial character) required in both tasks which facilitate fluency of implementation.

Current findings revealing strong relations between MA and RC in children's elementary grades corroborate previous Arabic ones (Abu Rabia et al, 2003;Taha, 2013), suggesting that MA actually contributes to RC [START_REF] Carlisle | Awareness of the structure and meaning of morphologically complex words: Impact on reading[END_REF][START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF]Siegel, 2008), and this contribution seems to be increase with age in morphology production, as demonstrated by differences between normal readers of grade 4 and grades 6 (e.g. [START_REF] Kuo | Morphological Awareness and Learning to Read: A Cross Language perspective[END_REF]. Furthermore, such strong associations between MA and RC indicate that awareness in the morphemic structure of words could guide children's understanding of novel morphologically complex words. This might, in turn, facilitate text comprehension. Conversely, children with weak MA may not be able to process proficiently the morphemic structure of complex words, causing difficulties in reading comprehension (Tong et al, 2011).

Our results also indicate that morphology measures explained significant levels of variability in RC scores, in addition to that predicted by RAN, nonverbal ability, and grade level.

Indeed, these data suggest that in comparison with each other, RAN and morphological ability explain unique, independent variability in comprehension levels in this Arabic-speaking cohort of children. In contrast, there was no evidence that morphology measures were predictive of better word reading. The association between MA and RC suggests that students' ability to reflect on and manipulate the smaller meaningful units that form words is crucial to access semantics [START_REF] Deacon | Morphological awareness: Just "more phonological"? The role of morphological and phonological awareness in reading development[END_REF][START_REF] Nagy | Contribution of morphology beyond phonology to literacy outcomes of upper elementary and middle-school students[END_REF]. Hence, our findings provide further empirical evidence demonstrating that the role of MA in children's reading development increases in later elementary grades because of an increasing number of complex words to which they are exposed in written form (Wolter, Wood, & D'zatko, 2009).

As expected, the performance of the reading-disabled children in RAN was significantly poorer than that of normal readers. These findings accord with previous ones demonstrating the role of RAN as a predictor of reading abilities in children learning transparent languages (Georgiou et al, 2008;[START_REF] Landerl | Development of word reading fluency and spelling in a consistent orthography:An 8-year follow-up[END_REF] and that RAN may be a better predictor of reading development in consistent than in inconsistent orthographies.

RAN was negatively correlated with both RC and reading rate [START_REF] Arnell | Decomposing the relation between Rapid Automatized Naming (RAN) and reading ability[END_REF]. These findings are broadly consistent with the view that rapid naming problems are one of the main characteristics of dyslexic children learning a transparent orthography. One hypothetical explanation for the relation in normal readers is that RAN expresses orthographic processing. An efficient access to the orthographic lexicon depends on the accurate integration of visual information about letter sequences in words. Delayed identification may hinder the storage of representations of orthographic patterns (i.e., whole words) [START_REF] Bowers | The role of naming speed within a model of reading acquisition[END_REF][START_REF] Conrad | Letter processing and the formation of memory representations in children with naming speed deficits[END_REF].

Beyond seriality, RAN is related to reading because it requires pronunciation of specific names which may depend on phonological processing and facilitate lexical access in normal readers [START_REF] Georgiou | Why is rapid automatized naming related to reading?[END_REF], as demonstrated by the correlation between pseudo-word identification and RAN. However, dyslexic children seem more reliant on MA on the basis of the association between this variable and RAN, as compensation of the phonological deficit, but it may slow down the automatic processing of extraction and induction of orthographic patterns.

Surprisingly, RAN showed no association with reading in dyslexics. This finding is somewhat consistent with Torgesen, Wagner, & Rashotte (1994), who reported that the unique and significant contribution of RAN to reading disappears after grade 3. A moderate to insignificant correlation was also found by [START_REF] Landerl | Predictors of developmental dyslexia in European orthographies with varying complexity[END_REF] , 1997[START_REF] Khomsi | LMC-R : Epreuve d'évaluation de la Compétence en Lecture[END_REF]Wolf & Bowers, 1999;Wolf, Bowers, & Biddle, 2000) and/or speed of processing deficits [START_REF] Breznitz | The Determinants of Reading Fluency: A comparison of dyslexic and average readers[END_REF] manifested in later fluency and comprehension problems.

Practical implications

The findings of the present study may contribute to the formal standardization of measures used to improve assessment procedures among Arabic speakers. This field of research would benefit from the development of standardized measures of MA with higher levels of reliability.

The most important practical aspect is the relation between MA, RAN, and reading abilities. There is an important need to include explicit instructions on morphological knowledge starting from initial grades of reading acquisition. Promoting students' morphological knowledge predicates their academic success [START_REF] Beck | Bringing words to life: Robust vocabulary instruction[END_REF]. As MA and RAN do not require reading, it may be advantageous that special diagnostic tools include MA and RAN.

Limitations and suggested studies

Several limitations need to be noted including the small sample size, which may have prevented us from detecting subtler differences in reading profiles. Another reason for caution in interpreting our findings is the use of a single measure of RC, the LMC-R test, in which children point to one among four pictures corresponding to the sentence. This task has not been used in other Arabic studies, and so futher empirical studies are needed to validate such an instrument with reasonable reliability.

Although control groups were designed in the research procedure, our three groups were imperfectly matched on word reading accuracy, indicating an overlap of age/reading level sampling, reducing the potential impact of word reading on our results. Further studies designed with two control groups (age-matched and reading level-matched) may maintain at least 3 years in chronological age to ensure the control of reading levels. Future research using experimental and longitudinal data is needed to investigate such reciprocal or recursive developmental processes.

Similarly, larger sample sizes within each grade would have provided greater power to detect differences related to grade level.

The Morphological production task, a writing-based task, might have yielded different results than an oral version. Future studies should consider using the oral version because of the lack in writing efficiency in dyslexics. Tasks with insignificant outcomes between groups in MA and RAN should be changed. As evidenced from the importance of MA on reading achievement, we need to test empirically the impact of training on MA and improving unexpectedly poor readers. Longitudinal studies have much to contribute to current educational practice, particularly when taken in light of such intervention studies.

Conclusions

In the present study, MA was an important discriminator between good and disabled readers, supporting a growing body of research emphasizing the crucial role of this variable, particularly awareness of derivational morphology, in skilled but also in poor readers. This provides empirical evidence of the importance of MA in decoding and RC as a function of age in Arabic and other orthographies. It should be noted that our findings can only inform the reader about associations among independent variables (MA and RAN) and dependent variables (decoding abilities and RC), not about causal relations. Thus, strong word identification and reading fluency are necessary but not sufficient for RC. A causal relation between the variables needs to be verified via intervention strategies aimed at assessing reading skills before and after direct instructions on the components of MA.

  9-11 ages(Layes, et al., 2014, 2015 Layes, et al., 2014, 2015a,b ?). A set of 80 stimuli was given (40 frequent words and 40 infrequent words). The words used varied for length (bisyllabic and disyllabic) and frequency (high and low); in addition to a list of 20 pseudo-words varied for orthographic length. Participants were required to read the stimuli aloud. The number of correct responses (accuracy) and reading speed (time in sec per list) were scored. The two word types were further categorized as high or low frequency. Frequency was determined by asking the Aralex lexical database for Modern Standard Arabic(Boudelaa & Marslen-Wislon, 2010). All frequent words contained more than 25 appearances per million.1. Single words reading test (α = .88, inter consistency coefficient).Participants read 80 partially vowelized words, 40 words matched for frequency (40 frequent / 40 infrequent). Each list was presented on a white sheet of A4 paper. Participants were required to read aloud the item correctly without any limitation in time. The score for this test was based on the total number of words correctly read.

[

  writer]), passive adjective (e.g., maktu:b [written]), place adverbial (e.g., maktab [office]), and reciprocal verbal (e.g., ka:taba [corresponded]) -Pattern Recognition task Participants were asked to decide whether the two words presented orally have (or not) the same pattern (e.g. CvCCaCa). Example:/ mighsala / [Laundry] and /mazra3a/ [Farm]. Participants responded by "yes" or "no".

Figure 1 .

 1 Figure 1. Participant's performances in RC, MA and RAN measures

  grade, but that letter and digit RAN continue to predict performance in normal readers until the age of 18, suggesting that the better predictive characteristic of letters and digits are due to fact that good readers automatize letter and digit naming after grade 1, whereas poor readers do not. Furthermore, our finding of RAN deficits in dyslexics support cumulating data indicating the presence of a second core deficit in dyslexia indexed by naming-speed (Wolf

	across European orthographies. This lack of
	relationship may be explained by the sequential characteristic of naming items, particularly in
	alphanumeric RAN tasks (letters, digits) (Ziegler, Pech-George, Dufau, & Grainger, 2010). Timed
	serial identification tasks across modalities appear to be consistently difficult for individuals with
	dyslexia (Ramus & Ahissar, 2012). However, RAN tasks differ in predicting literacy. While RAN
	Objects contributed more significantly in predicting reading comprehension (coefficient of Final
	Beta), RAN Digits and Shapes did not. On the contrary, RAN tasks were not predictive of reading
	words, which agrees with data published by Maya, Katzir, Wolf & Poldrack (2004), who asserted
	that color and object RAN are not predictors of reading performance in normal readers after the
	first or second

Table 1 .

 1 Participant's characteristics and mean performance in all measures by group: Dyslexics, Age-matched Controls (A.C) and Younger Controls (Y.C). (Standard deviations in parentheses).

		Dyslexics	Age Matched	Younger
				Controls
		(N= 20)	(N= 20)
	Variables	M (SD)	M (SD)	(N= 18) M (SD)	F (2.55)	Group comparisons
	Age	133.60 (8.37)	130.30 (4.76)	116.83 (5.12)	36.62***	A.C = DYS > Y.C
	Raven (Raw scores)	25.90 (3.00)	29.35 (4.72)	22.78 (5.24)	10.62***	A.C > DYS= Y.C
	Literacy skills

* P < 0.05; ** P < 0.01; *** P < 0.001; n.s. = not significant.

Table . 2

 . Partial correlations controlling for Age and IQ for normal readers (n= 38) above the diagonal, and for dyslexics (n= 20) below the diagonal P < 0.05; ** P < 0.01; *** P < 0.001.

	Morphological Awareness
	Morphology Dismantling	-.19	-1.47	.74	.03		-.008	.08	2.65*	.06
	Morphology Production	.004	.02				.14	1.41
	Pattern Recognition	.10	.78				.06	.71
	Ortho-Morphology Form	-.09	-.73				.13	1.45
	Relation Judgment	.11	1.01				.16	1.96*
	Variables	F.W	I.W		T.W.R	P.W	R.C	M.A	RAN
	Frequent Words (F.W)		.46***		.85***	.43***	.29	.26	-.47***
	Infrequent Words (I.W)	.65***		.86***	.36*	.37*	.23	-.47***

*

Morphology, John Benjamins Publishing Shu, H., McBride-Chang, C., Wu, S., & Liu, H. (2006). Understanding Chinese developmental dyslexia: morphological awareness as a core cognitive construct. J. Educ. Psychol. 98, 122-133 Siegel, L.S. (2008) Morphological awareness skills of English language learners and children with dyslexia.

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