Annals of Dyslexia最新文献

Beyond the established difficulties of individuals with dyslexia in word recognition and spelling, it remains unclear how severe their difficulties in comprehension are. To examine this, we performed a meta-analytic review. A random-effects model analysis of data from 76 studies revealed a large deficit in reading comprehension in individuals with dyslexia compared to their chronological-age (CA) controls (g = 1.43) and a smaller one compared to their reading-level (RL) matched controls (g = 0.64). Individuals with dyslexia also differed significantly from their CA controls in listening comprehension (g = 0.43). Results further showed significant heterogeneity in the effect sizes that was partly explained by orthographic consistency (the deficits were larger in languages with low orthographic consistency) and vocabulary matching (the deficits were larger in studies in which the groups were not matched on vocabulary). These findings suggest, first, that individuals with dyslexia experience significant difficulties in both reading and listening comprehension, but the effect sizes are smaller than those reported in the literature for word reading and spelling. Second, our findings suggest that the deficits in reading comprehension are likely a combination of deficits in both decoding and oral language skills.

Research has shown improved reading following visual magnocellular training in individuals with dyslexia. Many studies have demonstrated how the magnocellular pathway controls visual spatial attention. Therefore, we have investigated the relationship between magnocellular pathway and visual spatial attention deficits in dyslexia in order to better understand how magnocellular-based interventions may help children to learn to read. Magnocellular function, visual spatial attention, and reading abilities of thirty elementary school students with dyslexia, aged between 8 and 10, were measured. The experimental group received magnocellular-based visual motion training for 12 sessions, while the control group received neutral sessions. All tests were repeated at the end of the training and after 1 month. The magnocellular functioning, visual spatial attention, and reading abilities of the experimental group improved significantly compared to the controls. Additionally, improvement in reaction time of invalid conditions predicted improvements in saccadic eye movements. We conclude that visual magnocellular training improved saccadic eye movement control, visual spatial orientation, and reading ability.

Developmental dyslexia is a common neurodevelopmental disorder that is associated with alterations in the behavioral and neural processing of speech sounds, but the scope and nature of that association is uncertain. It has been proposed that more variable auditory processing could underlie some of the core deficits in this disorder. In the current study, magnetoencephalography (MEG) data were acquired from adults with and without dyslexia while they passively listened to or actively categorized tokens from a /ba/-/da/ consonant continuum. We observed no significant group difference in active categorical perception of this continuum in either of our two behavioral assessments. During passive listening, adults with dyslexia exhibited neural responses that were as consistent as those of typically reading adults in six cortical regions associated with auditory perception, language, and reading. However, they exhibited significantly less consistency in the left supramarginal gyrus, where greater inconsistency correlated significantly with worse decoding skills in the group with dyslexia. The group difference in the left supramarginal gyrus was evident only when neural data were binned with a high temporal resolution and was only significant during the passive condition. Interestingly, consistency significantly improved in both groups during active categorization versus passive listening. These findings suggest that adults with dyslexia exhibit typical levels of neural consistency in response to speech sounds with the exception of the left supramarginal gyrus and that this consistency increases during active versus passive perception of speech sounds similarly in the two groups.

Morpho-orthographic segmentation, rapid parsing of complex written words into their morphological components, is a potential source of difference in word recognition between struggling and typical readers. Although typical readers use morpho-semantic representations and morpho-orthographic segmentation in processing morphologically complex words, struggling readers typically rely on morpho-semantic processes involving coarse-grained processing of whole-word units rather than morpho-orthographic segmentation involving fine-grained letter processing. We tested this limitation in struggling readers, examining reading-ability differences among chronological-age, reading-age, and adult groups in morpho-orthographic segmentation in a primed lexical decision task. We transposed letter order across the morphological boundary of complex-word primes, focusing on disruption in priming effects of morphological and pseudo-orthographic primes that involved only orthographic overlap with target words. Morpho-semantic (coarse-grained) processing in Grade 2 typical readers was indicated by no moderation of priming effects by suffix types and letter transposition. By Grade 6, evidence of emerging fine grained analysis was found in both groups, with clear evidence of both coarse and fine grained analysis in adults. Grade 6 struggling readers showed comparable patterns of coarse and fine grained analysis as Grade 6 typical readers. Although they experienced generalized priming effects, struggling readers did experience response time disruption with transposed primes, indicating that they, like Grade 6 typical readers, adopt fine-grained processing perhaps as a precursor of emerging morpho-orthographic segmentation.

The goal of this study was to investigate the development of mental lexicon organization among typical and dyslexic native Arabic readers. The participants included 271 students, divided into dyslexic readers, age-matched typical readers, and typical readers 2 years younger. The lexical status of root and pattern morphemes was examined using two priming paradigms: masked priming and the cross-modal immediate repetition task. We conducted two visual lexical decision tasks (Experiment 1 for verb pattern, Experiment 3 for verb roots), and two auditory decision tasks (Experiment 2 for verb pattern, Experiment 4 for verb roots). In the visual tasks, the participants were asked to decide whether a visual stimulus was a real word or not by pressing the laptop keyboard’s “yes” or “no” button. The auditory experiments were conducted similarly to the visual experiments, except that the stimuli were auditory, to clarify the locus of the morphological deficit observed in the visual test of the dyslexic students, should there be such failures. Analysis of Experiment 1 showed that verb patterns are not lexical entities with a role in organizing the mental lexicon among typical and dyslexic readers of different ages. However, Experiment 3 indicated that roots do indeed constitute lexical entities with a role in organizing the mental lexicon among normal and dyslexic readers of different ages. In Experiment 2, the auditory-morpho priming effect in the word pattern test was stronger among dyslexic and young readers than among more skilled readers, and contributed to speeding up lexical decisions more than its quality, among all research groups. In Experiment 4, the auditory-morpho priming effect in the root test was stronger than the visual effect among all participants, and contributed to hastening lexical decisions and improving the quality of the answers (success percentage). The results showed that roots contribute to the reading process. However, their contribution is different among dyslexic readers. Its construction is slower and different from that of typical readers, whereas word patterns have no lexical representation among the three reader groups that are likely to facilitate lexical decisions. The results are discussed with reference to the latest research literature on morpheme type (root or pattern).

Translating the research base on effective reading instruction to the classroom has been a challenge. The delivery of these instructional methods requires practical skills coupled with an understanding of the aspects of language being taught. The purpose of this study was to explore the level of literacy knowledge of the English language held by educators who provide instruction to students in the primary grades. Data from 1369 classroom teachers, 74 reading interventionists, and 131 special educators comprising the analytic sample were collected as part of a training initiative in a US state. Participating educators completed a 50-item test of phonological sensitivity, phonemic awareness, decoding, encoding, and morphology. Multiple regression analyses confirmed differences in the levels of knowledge observed between the groups of educators. Reading interventionists demonstrated greater knowledge than classroom teachers and special educators in the total proportion of correct responses and across each domain. Classroom teachers demonstrated greater knowledge than special educators in phonological sensitivity and decoding but did not differ from each other in phonemic awareness, encoding, or morphology knowledge. Special educators provide intervention to students with the most severe forms of reading disabilities, yet they had the lowest level of knowledge. In contrast, reading interventionists, who provide intervention within general education, had the highest levels of knowledge. These findings suggest a need to elevate the knowledge of special educators and consider reading interventionists’ role in supporting students identified with a specific learning disability in reading.

Prior studies have suggested that grit and resilience predict both academic and career success. However, these qualities have not been examined in children with reading disorder (RD). We therefore investigated whether grit and resilience were associated with anxiety, depression, academic performance, and quality of life (QOL) in these students. This 3-year longitudinal cohort study included 163 participants with RD from 3 schools. Evaluations were completed by parents and/or teachers every 3 months. The Grit and Resilience Scale was adapted from the 10-item Connor-Davidson Resilience Scale and the 12-item Grit Scale. Outcome measures included anxiety (School Anxiety Scale – Teacher Report and the 8-item Spence Children’s Anxiety Scale), depression (Short Mood and Feelings Questionnaire), academic performance, and QOL (Pediatric QOL Inventory 4.0). Multivariate linear regression models (adjusting for age and sex) assessed the associations at baseline. Repeated measures analysis using mixed-effects models assessed the relationship longitudinally. There were statistically significant associations between grit and resilience and all outcomes at baseline and over time. After adjusting for age and sex, improved grit and resilience was associated with decreased anxiety (β =  − 0.4, p < 0.001) and improved academic performance (β = 0.5, p < 0.001) when grit and resilience was measured by teachers, as well as decreased depression (β =  − 0.3, p < 0.001) and improved QOL (β = 0.6, p < 0.001) when grit and resilience was measured by parents. Grit and resilience are significantly related to mental health, academic performance, and QOL in children with RD. This suggests that interventions to improve grit and resilience may lead to positive benefits.

Morphological awareness, or sensitivity to units of meaning, is an essential component of reading comprehension development. Current neurobiological models of reading and dyslexia have largely been built upon phonological processing models, yet reading for meaning is as essential as reading for sound. To fill this gap, the present study explores the relation between children’s neural organization for morphological awareness and successful reading comprehension in typically developing and impaired readers. English-speaking children ages 6–11 (N = 97; mean age = 8.6 years, 25% reading impaired) completed standard literacy assessments as well as an auditory morphological awareness task during functional near-infrared spectroscopy (fNIRS) neuroimaging, which included root (e.g., PERSON + al) and derivational (e.g., quick + LY) morphology. Regression analyses revealed that children’s morphological awareness predicted unique variance in reading comprehension above and beyond demographic factors, vocabulary knowledge, and decoding ability. Neuroimaging analyses further revealed that children with stronger reading comprehension showed greater engagement of brain regions associated with integrating sound and meaning, including left inferior frontal, middle temporal, and inferior parietal regions. This effect was especially notable for the derivational morphology condition that involved manipulating more analytically demanding and semantically abstract units (e.g., un-, -ly, -ion). Together, these findings suggest that successful reading comprehension, and its deficit in dyslexia, may be related to the ability to manipulate morpho-phonological units of word meaning and structure. These results inform theoretical perspectives on literacy and children’s neural architecture for learning to read.

We examined the response to a phonics through spelling intervention in 52 children with dyslexia by analyzing their phonological, morphological, and orthographical spelling errors both before and after the intervention whereas their spelling errors before the intervention were compared with those of 105 typically developing spellers. A possible compensatory role of semantics on the intervention effects was also investigated. Results showed that before the intervention, children with dyslexia and the typically developing children both made most morphological errors, followed by orthographic and phonological errors. Within each category, children with dyslexia made more errors than the typically developing children, with differences being largest for phonological errors. Children with dyslexia with better developed semantic representations turned out to make less phonological, morphological, and orthographic errors compared with children with dyslexia with less developed semantic representations. The intervention for children with dyslexia led to a reduction of all error types, mostly of the orthographic errors. In addition, semantics was related to the decline in phonological, morphological, and orthographic spelling errors. This study implicates that semantic stimulation could benefit the spelling development of children at risk for or with dyslexia.