The current project investigated the brain-behavior relationships between fusiform volume and orthographic processing in children with Reading Disability (RD) and Attention-Deficit/Hyperactivity Disorder (ADHD). It was hypothesized that there would be differences in fusiform volume between those with and without RD. Individuals with and without ADHD were not expected to differ in fusiform volume and an interaction in the RD/ADHD group was not expected. Children with RD/ADHD were expected to have similar volumes to children who have RD. It also was hypothesized that size of the left fusiform segments would be correlated with three orthographic processing tasks and tests of reading achievement (i.e., Orthographic Choice, Homophone/Pseudohomophone Choice and the Colorado Perceptual Speed Task; Letter Word Identification, Word Attack, and Reading Fluency). Results indicated that there were no group differences in fusiform volume between children with and without RD as well as with and without ADHD. There were also no relationships between the left fusiform and any of the orthographic or reading achievement measures. However, all three measures of orthographic processing were significantly related to the right posterior fusiform. Additionally, Homophone/Pseudohomophone Choice and Reading Fluency demonstrated a trend with the right anterior fusiform. The findings reported in this study were largely unexpected and suggest that further research examining the relationship between right fusiform volume and orthographic processing is warranted.

Une question centrale des recherches sur la lecture concerne la nature séquentielle ou parallèle de l’identification des mots pendant la lecture de phrases. L’hypothèse dominante postule que l’attention spatiale est allouée à un seul mot à la fois, et qu’avec cette contrainte, l’identification des mots doit forcément s’opérer de manière séquentielle. Cependant, un certain nombre de résultats suggèrent, au contraire, que l’attention spatiale peut être allouée à plusieurs mots à la fois, de manière distribuée. Cette attention disbribuée pourrait permettre l’identification en parallèle de plusieurs mots de manière simultanée, et les travaux présentés dans cette thèse cherchent à déterminer la viabilité de cette hypothèse. Notamment, nos travaux visent à préciser le niveau de traitement (visuel, orthographique, lexical, sémantique ou syntaxique) permis par cette attention distribuée. / This thesis addresses one of the most hotly debated issues in reading research: Are words processed serially or in parallel during reading? One could argue that this is primarily a question of visuo-spatial attention: is attention distributed across multiple words during reading? The research presented here suggests that attention can indeed be allocated to multiple words at once. It is further established that attention is a key factor driving (sub-lexical) orthographic processing. The next question, then, is whether multiple lexical representations can be activated in parallel. This thesis comprises a wealth of evidence for parallel lexical activation: firstly we have found that readers activate embedded words (e.g., ‘use’ in ‘houses’) alongside the word that is to be recognized, indicating that parallel lexical processing would occur even if readers could effectively focus their attention on single words. Moreover, we have found that semantic and syntactic categorization decisions about foveal target words are influenced by the semantic and syntactic aspects of surrounding words, even when all these words are presented for a duration shorter than the average time needed to recognize a single word. Hence, given that readers’ attention is spread across multiple words and that multiple lexical representations can be activated in parallel, it seems reasonable to claim that the reading system is in principle a parallel processing system.

We examined the relationship between orthographic processing and spelling in French immersion children. Study 1 included 148 first graders and they were assessed on orthographic processing and spelling in English and French. In Study 2, we followed 69 second graders for two years. Orthographic processing and spelling in English and French were administered in second and third grade. In Study 3, we analyzed the spelling errors made by the third graders in Study 2. In Study 1, we found a within-language relationship in English and French between orthographic processing and spelling. Cross-language transfer from French orthographic processing to English spelling was also observed. In Study 2, Grade 2 English spelling predicted gains in Grade 3 English and French orthographic processing. Study 3 showed that children made transfer errors when spelling in English and French. Overall, the current research highlights the importance of orthographic processing and spelling in French immersion children.

We examined the relationship between orthographic processing and spelling in French immersion children. Study 1 included 148 first graders and they were assessed on orthographic processing and spelling in English and French. In Study 2, we followed 69 second graders for two years. Orthographic processing and spelling in English and French were administered in second and third grade. In Study 3, we analyzed the spelling errors made by the third graders in Study 2. In Study 1, we found a within-language relationship in English and French between orthographic processing and spelling. Cross-language transfer from French orthographic processing to English spelling was also observed. In Study 2, Grade 2 English spelling predicted gains in Grade 3 English and French orthographic processing. Study 3 showed that children made transfer errors when spelling in English and French. Overall, the current research highlights the importance of orthographic processing and spelling in French immersion children.

Identifier le plus complètement possible les processus impliqués dans le développement de la lecture est nécessaire afin de permettre à un maximum d’enfants d’accéder à la maîtrise de la langue écrite. Si l’importance des compétences linguistiques (e.g., conscience phonologique) a été largement démontrée, peu d’études en revanche se sont spécifiquement intéressées au rôle des processus visuo-attentionnels et perceptifs dans l’apprentissage de la lecture ou à leur implication dans certains dysfonctionnements langagiers. Dans ce cadre, nous avons réalisé trois études longitudinales afin d'interroger le rôle des processus visuo-attentionnels et perceptifs, spécifiques au codage orthographique, dans l'apprentissage de la lecture. Le premier objectif de cette thèse était d'étudier si ces processus constituaient des pré-requis à l'apprentissage de la lecture. Nous avons administré à 89 enfants entre la MSM et le CP, une tâche d'identification de cible en fovéa (étude 1) et en parafovéa (étude 2). Nous avons observé que la précocité de la mise en place du codage orthographique prédisait le niveau de lecture au CP. Le second objectif était de dépister en maternelle, les enfants susceptibles de présenter des difficultés en lecture. Dans cette optique, les capacités visuo-attentionnelles et perceptives ont été évaluées auprès de 78 enfants entre la GSM et le CP, au moyen du logiciel VISA-kids que nous avons développé. Le traitement local prédisait les compétences en lecture au CP. Notre travail a ainsi mis en évidence l'importance des capacités visuo-attentionnelles et perceptives, à la fois pour l'apprentissage de la lecture et la prévention des difficultés en lecture. / Identifying the processes involved in the development of reading is necessary to enable as many children as possible to become skilled processors of written language. Although the importance of spoken language skills (e.g., phonological awareness) has been widely demonstrated, few studies, however, have specifically investigated the role of visuo-attentional and perceptual processes in learning to read, or their possible involvement in reading disorders. In this context, we completed three longitudinal studies to examine the role of visuo-attentional and perceptual processes involved in orthographic coding during the first steps of learning to read. The first goal of this thesis was to investigate whether these processes were prerequisites for learning to read. We administered to 89 preschool children and first graders, a target identification task in the fovea (study 1) and the parafovea (study 2). We observed that the precocity of establishment of efficient orthographic coding predicted reading level in first grade. The second objective aimed at improving screening for future reading difficulties in kindergarten children. We developed software (VISA-kids) for assessing visuo-attentional and perceptual abilities that we evaluated in 78 preschool and first grade children. Local processing predicted reading level in the first grade. Our work has highlighted the importance of visuo-attentional and perceptual processes for learning to read and the importance of considering these factors for the prevention of reading difficulties.

The current study aimed to develop a model of reading comprehension for children in middle primary school. As part of this overall aim there was a particular focus on the contribution of different types of memory to reading comprehension. The variables selected for consideration were identified from the child and adult literature and were of three types: word reading, language, and memory. The sample comprised 180 primary school children in grades 3-5 recruited from two primary schools. Their ages ranged from 8 years 7 months to 11 years 11 months. The reading comprehension measure was in a multiple-choice format with the text available when answering the questions. The five word reading measures were phonological recoding, orthographic processing, text reading accuracy, text reading speed, and a measure of exposure to print and reading experience. It is recognised that, although exposure to print is closely associated with word reading skills, it is not a direct measure of word reading. The language measures were oral comprehension, receptive vocabulary and receptive grammatical skills. The memory measures included measures of verbal and visuospatial short-term memory, measures of verbal and visuospatial working memory, a measure of the ability to inhibit irrelevant information from working memory and a measure of longer term verbal learning and retrieval. Correlational and hierachical multiple regression analyses were used to extrapolate the relationships between and among these variables. The results revealed that, after controlling for age and general intellectual ability, the word reading and the language variables had a much stronger relationship with reading comprehension than the memory variables. The strongest independent predictors of reading comprehension were orthographic processing and oral comprehension. An additive combination of these two variables provided a more parsimonious model of reading comprehension than other models under consideration. It was concluded that for the age range in this study, language and word reading skills are the main predictors of reading comprehension and that the different types of memory do not make major contributions to reading comprehension.

<p>The general aim of this thesis was to investigate phonological processing skills in dyslexic children and adults and their relation to speech perception. Dyslexia can be studied at various levels: at a biological, cognitive and an environmental level. This thesis mainly looks at environmental and cognitive factors. It is a commonly held view that dyslexia is related to problems with phonological processing, that is, dyslexics have problems dealing with the sound structure of language. The problem is for example seen in tasks where the individual has to manipulate sound segments in the spoken language, read non-words, rapidly name pictures and digits, keep verbal material in short-term memory, and categorize and discriminate sound contrasts in speech perception. To fully understand the dyslexic’s problems we have to investigate both children and adults since the problems might change during the lifespan as a result of changes in the language system and compensatory mechanisms in the poor reader. Research indicates that adult dyslexics can reach functional reading proficiency but still perform poorly on tasks of phonological processing. Even though they can manage many everyday reading situations problems often arise when adult dyslexics enter higher education. The phonological problems of dyslexics are believed to be related to the underlying phonological representations of the language. The phonological representations have been hypothesized to be weakly specified or indistinct and/or not enough segmented. Deviant phonological representations are believed to cause problems when the mapping of written language is to be made to the phonological representations of spoken language during reading acquisition. In Paper 1 adults’ phonological processing and reading habits were investigated in order to increase our understanding of how the reading problems develop into adulthood and what the social consequences are. The results showed that adult dyslexics remained impaired in their phonological processing and that they differed substantially from controls in their choices regarding higher education and also regarding reading habits. Paper 2 reviews research that has used the sine wave speech paradigm in studies of speech perception. The paper also gives a detailed description of how sine wave speech is made and how it can be characterized. Sine wave speech is a course grained description of natural speech lacking phonetic detail. In Paper 3 sine wave speech varying with regard to how much suprasegmental information it contains is employed. Results showed that dyslexics were poorer at identifying monosyllabic words but not disyllabic words and a sentence, plausibly because the dyslexics had problems identifying the phonetic information in monosyllabic words. Paper 4 tested dyslexics’ categorization performance of fricative-vowel syllables and the results showed that dyslexics were less consistent than controls in their categorization indicating poorer sensitivity to phonetic detail. In all the results of the thesis are in line with the phonological deficit hypothesis as revealed by adult data and the performance on task of speech perception. It is concluded that dyslexic children and adults seem to have less well specified phonological representations. </p>

The general aim of this thesis was to investigate phonological processing skills in dyslexic children and adults and their relation to speech perception. Dyslexia can be studied at various levels: at a biological, cognitive and an environmental level. This thesis mainly looks at environmental and cognitive factors. It is a commonly held view that dyslexia is related to problems with phonological processing, that is, dyslexics have problems dealing with the sound structure of language. The problem is for example seen in tasks where the individual has to manipulate sound segments in the spoken language, read non-words, rapidly name pictures and digits, keep verbal material in short-term memory, and categorize and discriminate sound contrasts in speech perception. To fully understand the dyslexic’s problems we have to investigate both children and adults since the problems might change during the lifespan as a result of changes in the language system and compensatory mechanisms in the poor reader. Research indicates that adult dyslexics can reach functional reading proficiency but still perform poorly on tasks of phonological processing. Even though they can manage many everyday reading situations problems often arise when adult dyslexics enter higher education. The phonological problems of dyslexics are believed to be related to the underlying phonological representations of the language. The phonological representations have been hypothesized to be weakly specified or indistinct and/or not enough segmented. Deviant phonological representations are believed to cause problems when the mapping of written language is to be made to the phonological representations of spoken language during reading acquisition. In Paper 1 adults’ phonological processing and reading habits were investigated in order to increase our understanding of how the reading problems develop into adulthood and what the social consequences are. The results showed that adult dyslexics remained impaired in their phonological processing and that they differed substantially from controls in their choices regarding higher education and also regarding reading habits. Paper 2 reviews research that has used the sine wave speech paradigm in studies of speech perception. The paper also gives a detailed description of how sine wave speech is made and how it can be characterized. Sine wave speech is a course grained description of natural speech lacking phonetic detail. In Paper 3 sine wave speech varying with regard to how much suprasegmental information it contains is employed. Results showed that dyslexics were poorer at identifying monosyllabic words but not disyllabic words and a sentence, plausibly because the dyslexics had problems identifying the phonetic information in monosyllabic words. Paper 4 tested dyslexics’ categorization performance of fricative-vowel syllables and the results showed that dyslexics were less consistent than controls in their categorization indicating poorer sensitivity to phonetic detail. In all the results of the thesis are in line with the phonological deficit hypothesis as revealed by adult data and the performance on task of speech perception. It is concluded that dyslexic children and adults seem to have less well specified phonological representations.

This thesis examined the role of metalinguistic skills in concurrent and subsequent word-level reading and oral vocabulary among Chinese-English bilingual children who learned Chinese as their heritage language and English as their societal language. While previous studies on biliteracy development among this group of children have mostly focused on one of the two languages, this thesis gave equal emphasis to both languages. The research had two general purposes: 1) to investigate the role of phonological awareness, morphological awareness and orthographic processing in predicting word-level reading and oral vocabulary in Chinese and English concurrently and longitudinally; and 2) to examine the cross-linguistic role of phonological and morphological awareness to word-level reading and vocabulary, concurrently and longitudinally, between Chinese and English. These goals were explored through two interrelated studies, using path analyses. The participants included 91 Chinese-English bilingual children, recruited from kindergarten and Grade 1 Chinese heritage language classes in Canada. They were tested twice, one year apart, on a battery of cognitive and literacy measures in Chinese and English. Findings of Study 1 on within-language relationships indicated that, for word-level reading, all three metalinguistic skills were independent concurrent predictors in English, whereas only morphological awareness was predictive in Chinese. For oral vocabulary, morphological awareness was the only concurrent predictor in both languages. The longitudinal contributions of these metalinguistic skills were mostly mediated through the auto-regressors of the literacy outcomes. Findings of Study 2 on between-language relationships demonstrated that Chinese phonological awareness directly contributed to concurrent and subsequent English word reading beyond the effect of concurrent English phonological awareness. Yet, Chinese morphological awareness indirectly predicted concurrent and subsequent English oral vocabulary through concurrent English morphological awareness. Similarly, English morphological awareness only indirectly predicted concurrent and subsequent Chinese oral vocabulary. These findings suggest that different metalinguistic skills are required for literacy development in Chinese and English. Moreover, metalinguistic skills transfer to literacy, even across two typologically distant languages, but the transfer patterns of phonological and morphological awareness to different literacy skills vary considerably. These results are discussed in light of current reading and transfer models as well as linguistic contexts of biliteracy acquisition.

This thesis examined the role of metalinguistic skills in concurrent and subsequent word-level reading and oral vocabulary among Chinese-English bilingual children who learned Chinese as their heritage language and English as their societal language. While previous studies on biliteracy development among this group of children have mostly focused on one of the two languages, this thesis gave equal emphasis to both languages. The research had two general purposes: 1) to investigate the role of phonological awareness, morphological awareness and orthographic processing in predicting word-level reading and oral vocabulary in Chinese and English concurrently and longitudinally; and 2) to examine the cross-linguistic role of phonological and morphological awareness to word-level reading and vocabulary, concurrently and longitudinally, between Chinese and English. These goals were explored through two interrelated studies, using path analyses. The participants included 91 Chinese-English bilingual children, recruited from kindergarten and Grade 1 Chinese heritage language classes in Canada. They were tested twice, one year apart, on a battery of cognitive and literacy measures in Chinese and English. Findings of Study 1 on within-language relationships indicated that, for word-level reading, all three metalinguistic skills were independent concurrent predictors in English, whereas only morphological awareness was predictive in Chinese. For oral vocabulary, morphological awareness was the only concurrent predictor in both languages. The longitudinal contributions of these metalinguistic skills were mostly mediated through the auto-regressors of the literacy outcomes. Findings of Study 2 on between-language relationships demonstrated that Chinese phonological awareness directly contributed to concurrent and subsequent English word reading beyond the effect of concurrent English phonological awareness. Yet, Chinese morphological awareness indirectly predicted concurrent and subsequent English oral vocabulary through concurrent English morphological awareness. Similarly, English morphological awareness only indirectly predicted concurrent and subsequent Chinese oral vocabulary. These findings suggest that different metalinguistic skills are required for literacy development in Chinese and English. Moreover, metalinguistic skills transfer to literacy, even across two typologically distant languages, but the transfer patterns of phonological and morphological awareness to different literacy skills vary considerably. These results are discussed in light of current reading and transfer models as well as linguistic contexts of biliteracy acquisition.