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1.
Dyslexia is a specific learning disability characterized by difficulties with accurate and/or fluent word recognition and
by poor spelling abilities. The absence of other high level cognitive deficits in the dyslexic population has led some authors
to propose that non-strategical processes like implicit learning could be impaired in this population. Most studies have addressed
this issue by using sequence learning tasks, but so far the results have not been conclusive. We test this hypothesis by comparing
the performance of dyslexic children and good readers in both implicit and explicit versions of the sequence learning task,
as well as in another implicit learning task not involving sequential information. The results showed that dyslexic children
failed to learn the sequence when they were not informed about its presence (implicit condition). In contrast, they learned
without significant differences in relation to the good readers group when they were encouraged to discover the sequence and
to use it in order to improve their performance (explicit condition). Moreover, we observed that this implicit learning deficit
was not extended to other forms of non-sequential, implicit learning such as contextual cueing. In this case, both groups
showed similar implicit learning about the information provided by the visual context. These results help to clarify previous
contradictory data, and they are discussed in relation to how the implicit sequence learning deficit could contribute to the
understanding of dyslexia. 相似文献
2.
Graph complexity as measured by topological entropy has been previously shown to affect performance on artificial grammar learning tasks among typically developing children. The aim of this study was to examine the effect of graph complexity on implicit sequential learning among children with developmental dyslexia. Our goal was to determine whether children’s performance depends on the complexity level of the grammar system learned. We conducted two artificial grammar learning experiments that compared performance of children with developmental dyslexia with that of age- and reading level-matched controls. Experiment 1 was a high topological entropy artificial grammar learning task that aimed to establish implicit learning phenomena in children with developmental dyslexia using previously published experimental conditions. Experiment 2 is a lower topological entropy variant of that task. Results indicated that given a high topological entropy grammar system, children with developmental dyslexia who were similar to the reading age-matched control group had substantial difficulty in performing the task as compared to typically developing children, who exhibited intact implicit learning of the grammar. On the other hand, when tested on a lower topological entropy grammar system, all groups performed above chance level, indicating that children with developmental dyslexia were able to identify rules from a given grammar system. The results reinforced the significance of graph complexity when experimenting with artificial grammar learning tasks, particularly with dyslexic participants. 相似文献
3.
The present study examines implicit sequence learning in adult dyslexics with a focus on comparing sequence transitions with different statistical complexities. Learning of a 12-item deterministic sequence was assessed in 12 dyslexic and 12 non-dyslexic university students. Both groups showed equivalent standard reaction time increments when the sequence was unexpectedly changed, suggesting that learning of the sequence took place. However, a novel analysis comparing transitions of differing complexity within the learning blocks indicated that dyslexic participants were impaired only for higher-order but not first-order sequence learning. No difference was found in the explicit awareness contribution between the two groups and this was found not to correlate with reaction time performance. This result suggests that statistical complexity of the sequence may account for intact and impaired learning performance in dyslexia. 相似文献
4.
There’s a long held view that chunks play a crucial role in artificial grammar learning performance. We compared chunk strength influences on performance, in high and low topological entropy (a measure of complexity) grammar systems, with dyslexic children, age-matched and reading-level-matched control participants. Findings show that age-matched control participants’ performance reflected equivalent influence of chunk strength in the two topological entropy conditions, as typically found in artificial grammar learning experiments. By contrast, dyslexic children and reading-level-matched controls’ performance reflected knowledge of chunk strength only under the low topological entropy condition. In the low topological entropy grammar system, they appeared completely unable to utilize chunk strength to make appropriate test item selections. In line with previous research, this study suggests that for typically developing children, it is the chunks that are attended during artificial grammar learning and create a foundation on which implicit associative learning mechanisms operate, and these chunks are unitized to different strengths. However, for children with dyslexia, it is complexity that may influence the subsequent memorability of chunks, independently of their strength. 相似文献
5.
This paper investigates Spanish dyslexic spelling abilities: specifically, the influence of syllabic linguistic structure (simple vs consonant cluster) on children's spelling performance. Consonant clusters are phonologically complex structures, so it was anticipated that there would be lower spelling performance for these syllabic structures than in simple ones, because of the poor phonological processing of dyslexic children. The participants were 31 dyslexic children, 31 chronological age‐matched children and 31 reading level‐matched children. A dictation task with words and pseudowords (with and without consonant clusters) was used. Word lexical frequency was controlled. The results show that the spelling of consonant clusters presents difficulties for dyslexic spelling performance despite this structure being orthographically consistent. Dyslexic children present a higher performance difference in items with consonant clusters than in simple items, compared with typically developing children. The work raises questions about the items used for the identification of dyslexic children's difficulties. 相似文献
6.
Rachel Schiff Miki Cohen Elisheva Ben-Artzi Ayelet Sasson Dorit Ravid 《Scientific Studies of Reading》2016,20(2):140-154
The aim of the present study is to examine the morphological knowledge of readers with developmental dyslexia compared to chronological age and reading-level matched controls. The study also analyzes the errors dyslexics make and their metamorphological awareness compared to controls. Participants included 31 seventh-grade dyslexic children and two matched control groups of normal readers: 34 seventh graders matched for chronological age and 32 third graders matched for reading age. Two tasks were administered via the auditory modality—morphological priming and morphological analogies task. We also performed error analysis and a metamorphological interview. Our analyses reveal that although dyslexics perform equally to chronological age matched controls on the priming task and similarly to reading-level matched controls on the morphological analogies task, their errors and metamorphological awareness are qualitatively different. 相似文献
7.
Two studies were conducted to investigate the correlates of hyperlexia in Brazilian Portuguese-speaking children with the
diagnosis of autism spectrum disorder (ASD). Study 1 involved 3 groups of school age children individually matched for word
reading ability: 6 ASD hyperlexic children, 6 ASD non-hyperlexic children, and 6 typically developing children. Study 2 involved
2 ASD preschool hyperlexic boys, and a group of 21 typical children of similar word reading ability. In both studies, participants
were administered several reading measures as well as measures of cognitive and linguistic abilities that have been associated
with variations in typical and dyslexic reading, namely, vocabulary, phonological processes, and rapid naming. Results suggest
that ASD hyperlexic reading differs from both typical and ASD non-hyperlexic reading. In particular, they suggest that hyperlexics
learn to compute letter-sound relations implicitly, on the basis of statistical learning. Although the hyperlexic children
could read nonwords as well as the typical and the ASD non-hyperlexic children, they performed significantly worse than these
groups of children on a letter-sound knowledge task. They also performed relatively poorly on a phonological awareness task.
It is suggested that hyperlexics’ indifference to language as a meaningful, communicative device may be the key to their exceptionally
good and precocious development of word reading ability. 相似文献
8.
Heinz Wimmer 《Reading and writing》1996,8(2):171-188
The present study retrospectively examined early difficulties with phonological coding and phonemic segmentation of German children who after four years in school were diagnosed as dyslexic. German, in comparison to English, exhibits rather simple and straight-forward grapheme-phoneme correspondences, and the initial teaching approach was phonics oriented. Despite these favorable circumstances for the acquisition of phonological coding, the majority of the later dyslexic children had particular difficulties with the accurate reading of nonwords and of unfamiliar words after about seven months of reading instruction. However, there were enormous differences between the dyslexic children. Two of them were completely unable to blend phonemes into pronunciations, another seven were slow and error prone decoders, and three children had slow and laborious pronunciation assembly as the core problem. The majority of the later dyslexic children also exhibited phonemic segmentation deficits as tested with a nonword spelling task and a phoneme reversal task. In correspondence with findings from older German dyslexic children, the early difficulties with accurate phonological coding and phonemic segmentation were no longer found at the end of grade four. Children then suffered from very slow reading and poor spelling. In general, the difficulties of German dyslexic children emphasize the phonological impairment account of dyslexia. More specifically, these findings suggest that the assembly of letter sounds into pronunciations is particularly affected in the early phase of learning to read a consistent orthography. 相似文献
9.
Insufficient knowledge of the subtle relations between words’ spellings and their phonology is widely held to be the primary limitation in developmental dyslexia. In the present study the influence of phonology on a semantic-based reading task was compared for groups of readers with and without dyslexia. As many studies have shown, skilled readers make phonology-based false-positive errors to homophones and pseudohomophones in the semantic categorization task. The basic finding was extended to children, teens, and adults with dyslexia from familial and clinically-referred samples. Dyslexics showed the same overall pattern of phonology errors and the results were consistent across dyslexia samples, across age groups, and across experimental conditions using word and nonword homophone foils. The dyslexic groups differed from chronological-age matched controls by having elevated false-positive homophone error rates overall, and weaker effects of baseword frequency. Children with dyslexia also made more false-positive errors to spelling control foils. These findings suggest that individuals with dyslexia make use of phonology when making semantic decisions both to word homophone and non-word pseudohomophone foils and that dyslexics lack adequate knowledge of actual word spellings, compared to chronological-age and reading-level matched control participants. 相似文献
10.
Morphological awareness in developmental dyslexia 总被引：5，自引：0，他引：5
This study examines morphological awareness in developmental dyslexia. While the poor phonological awareness of dyslexic children
has been related to their difficulty in handling the alphabetical principle, less is known about their morphological awareness,
which also plays an important part in reading development. The aim of this study was to analyze in more detail the implications
of the phonological impairments of dyslexics in dealing with larger units of language such as morphemes. First, the performance
of dyslexic children in a series of morphological tasks was compared with the performance of children matched on reading-level
and chronological age. In all the tasks, the dyslexic group performed below the chronological age control group, suggesting
that morphological awareness cannot be developed entirely independently of reading experience and/or phonological skills.
Comparisons with the reading-age control group indicated that, while the dyslexic children were poorer in the morphemic segmentation
tasks, they performed normally for their reading level in the sentence completion tasks. Furthermore, they produced more derived
words in the production task. This suggests that phonological impairments prevent the explicit segmentation of affixes while
allowing the development of productive morphological knowledge. A second study compared dyslexic subgroups defined by their
degree of phonological impairment. Our results suggest that dyslexics develop a certain type of morphological knowledge, which
they use as a compensatory reading strategy. 相似文献
11.
This study focuses on relations between 7- and 9-year-old children’s and adults’ metacognitive monitoring and control processes. In addition to explicit confidence judgments (CJ), data for participants’ control behavior during learning and recall as well as implicit CJs were collected with an eye-tracking device (Tobii 1750). Results revealed developmental progression in both accuracy of implicit and explicit monitoring across age groups. In addition, efficiency of learning and recall strategies increases with age, as older participants allocate more fixation time to critical information and less time to peripheral or potentially interfering information. Correlational analyses, recall performance, metacognitive monitoring, and controlling indicate significant interrelations between all of these measures, with varying patterns of correlations within age groups. Results are discussed in regard to the intricate relationship between monitoring and recall and their relation to performance. 相似文献
12.
Spoken language consists of a complex, sequentially arrayed signal that contains patterns that can be described in terms of statistical relations among language units. Previous research has suggested that a domain-general ability to learn structured sequential patterns may underlie language acquisition. To test this prediction, we examined the extent to which implicit sequence learning of probabilistically structured patterns in hearing adults is correlated with a spoken sentence perception task under degraded listening conditions. Performance on the sentence perception task was found to be correlated with implicit sequence learning, but only when the sequences were composed of stimuli that were easy to encode verbally. Implicit learning of phonological sequences thus appears to underlie spoken language processing and may indicate a hitherto unexplored cognitive factor that may account for the enormous variability in language outcomes in deaf children with cochlear implants. The present findings highlight the importance of investigating individual differences in specific cognitive abilities as a way to understand and explain language in deaf learners and, in particular, variability in language outcomes following cochlear implantation. 相似文献
13.
14.
The existing literature on developmental dyslexia (hereafter: dyslexia) often focuses on isolating cognitive skills which differ across dyslexic and control participants. Among potential correlates, previous research has studied group differences between dyslexic and control participants in performance on statistical learning tasks. A statistical learning deficit has been proposed to be a potential cause and/or a marker effect for early detection of dyslexia. It is therefore of practical importance to evaluate the evidence for a group difference. From a theoretical perspective, such a group difference would provide information about the causal chain from statistical learning to reading acquisition. We provide a systematic review of the literature on such a group difference. We conclude that there is insufficient high-quality data to draw conclusions about the presence or absence of an effect. 相似文献
15.
Fiona R. Simmons Chris Singleton 《Journal of Research in Special Educational Needs》2009,9(3):154-163
This paper reports the findings of two related studies that examined the mathematical strengths and weaknesses of children with dyslexia. In study one, dyslexic children were compared to children without special educational needs on tests that assessed arithmetic fact recall, place value understanding and counting speed. Study two used the same methodology, but matched the dyslexic children with the non‐dyslexic children on a number of factors, including intellectual ability. This excluded the possibility that confounding variables accounted for the differences between the groups in study one. Both studies indicated that the dyslexic children had slower and less accurate number fact recall than the non‐dyslexic children, but had unimpaired place value understanding. The results for counting speed were more equivocal, but there was a trend for the dyslexic children to be slower counters. The results suggest that dyslexia is not normally associated with a general mathematical impairment, but rather an uneven profile of skills. This profile can be explained in terms of the phonological processing weaknesses associated with dyslexia. The finding that dyslexic children have a specific difficulty recalling arithmetic facts suggests that a teaching programme that emphasises mental methods may disadvantage them. 相似文献
16.
《Scientific Studies of Reading》2013,17(4):321-340
This study examined whether the characteristic reading speed impairment of German dyslexic children results from a general skill-automatization deficit sensu Nicolson and Fawcett (1990) or from more specific deficits in visual naming speed and phonological skills. The hypothesized skill-automatization deficit was assessed by balancing, peg moving, and visual search. Rapid "automatized" naming tasks served as measures of impaired visual naming speed, and the phonological deficit was assessed by speech perception, phonological sensitivity, and phonological memory tasks. Dyslexic German children and age-matched control children (all boys) were tested at the end of Grade 2 and as participants of a longitudinal study also at the beginning of Grade 1. No evidence for a skill-automatization deficit was found, as the dyslexic children did not differ at all on the balancing tasks and little on the other nonverbal skill tasks. However, the dyslexic children showed impaired visual naming speed and impaired phonological memory performance that were observed not only in Grade 2 but also before learning to read. Overall, the findings support the conclusion that, even in regular orthographies, difficulties in learning to read are due to a phonological deficit and not to a general skill-automatization deficit. 相似文献
17.
Lucia Bigozzi Giuliana Pinto Renato Donfrancesco 《International Journal of Disability, Development & Education》2016,63(4):450-466
Several studies have explored the relationship between dyslexia and creativity, but results have been rather mixed. This study examines whether Italian dyslexic children are more creative than their peers without a reading impairment. One hundred ninety Italian children aged between 9 and 13 participated in this study, divided into two groups: Ninety five dyslexic students and ninety five peers without a reading impairment. All the participants’ creativity skills were assessed. The results indicated that dyslexic children outperformed their peers in the total score, and in the originality, elaboration, and titles sub-scores, whereas no differences were found in the fluency and flexibility sub-scores. The results are discussed in relation to the practical implications, and provide indications for supportive learning environments. 相似文献
18.
We investigated the relationship between reading and explicit and implicit categorical learning by comparing university students
with poor reading to students with normal reading abilities on two categorical learning tasks. One categorical learning task
involved sorting simple geometric shapes into two groups according to a unidimensional rule. The sorting rule was easily stated
by the participants, consistent with explicit learning, and all participants attained criterion levels of performance. The
second task involved the integration of features on different dimensions with a more complex rule that could not be described
by participants, even though most could attain criterion levels of performance consistent with implicit learning. Poor readers
performed as well as those without reading problems in explicit learning but not in implicit learning. Implicit learning was
correlated with word reading, phonological decoding, and orthographic skill, independent of verbal ability. We consider the
role of implicit learning in reading, and how a deficit could impair phonological and orthographic representation and processing. 相似文献
19.
Educational research places emphasis on the fact that individuals who have experienced repeated failures may develop an attribution profile characterized by a bias towards primarily external causes. The aim of this study is to compare the attribution style of adolescents with Down's syndrome with that of normal children and adolescents matched for mental and chronological age; three groups consisting of 10 participants each were employed, an experimental group and two control groups were employed. The experimental group were Down's syndrome adolescents. Participants in the first control group were matched to the experimental groups for mental age, and those in the second for chronological age. All of the 30 participants were given an attribution test consisting of 14 items, illustrative of everyday or school‐related events in which the main character experienced either success or failure. The participants were asked to attribute the character's performance to one of five causes: ability, effort, help, luck or task difficulty. The results show that adolescents with Down's syndrome tend to attribute performance to external help. Their attribution style would seem to be very similar to that of the control participants matched for mental age. 相似文献
20.
Shelley Shaul 《Reading and writing》2012,25(5):1143-1170
This study examined the differences in processing between regular and dyslexic readers in a lexical decision task in different
visual field presentations (left, right, and center). The research utilized behavioral measures that provide information on
accuracy and reaction time and electro-physiological measures that permit the examination of brain activity during cognitive
processing. Two groups of university students, regular and dyslexic readers, were matched on age, gender, intelligence, socioeconomic
status, and handedness. A lexical decision task was used in order to examine the processes during word recognition. Subjects
were required to decide whether a sequence of letters constituted a real word existing in spoken language or whether the stimulus
seen was not an accurate word. For the behavioral measures, it was found that the dyslexics read slower and with more errors
than the regular readers. Moreover, the ERP components appeared later in dyslexics as compared to regular readers in this
task. The performance of the dyslexics improved and even approached that of the regular readers when the stimuli were presented
to the left visual field. Thus, it seems that the dyslexics were relying more on their right hemisphere for linguistic processing,
whereas the regular readers were relying more on their language areas in the left hemisphere. 相似文献