This study of 65 children (ages 10-13) with dyslexia found no discrete subgroups. Variability in performance on reading tasks was quite similar for the dyslexic and reading age-control groups. A few children with dyslexia resembled phonological dyslexics and surface dyslexics, but these subjects were still part of a continuum. (Author/JDD)

A comparison of severely dyslexic adolescents with younger, normal readers matched for reading level and IQ revealed that phonological discrimination ability accounted for much of the variance in reading ability between dyslexics and normal readers. The results suggest that dyslexics may have specific difficulties with the retrieval of the sounds…

This study of 11 3-generation families supported the hypothesis of autosomal dominant inheritance with reduced penetrance. Data did not support an increased frequency of males, left-handedness, or autoimmune disorders in dyslexics. Severity was greater in males. Long-term outcome was comparable in dyslexics and nondyslexics. (JDD)

Examines the phonological deficit hypothesis in developmental dyslexia with readers in Chinese. Compares 56 Chinese dyslexic children with average readers of the same age in phonological awareness and phonological memory skills. Suggests that Chinese children with dyslexia have deficits in processing phonological information like their alphabetic…

A connectionist feedforward network implementing a mapping from orthography to phonology is described. This model develops a view of the reading system that accounts for irregular word and pseudoword reading without relying on any system of implicit or explicit conversion rules. The model accounts for skilled reading performance and the patterns…

Tests of phonological, speed, motor and cerebellar tasks were given to 36 students with learning disabilities, 29 of whom were classified as non-discrepant (IQ<90) and 7 as discrepant, (IQ at least 90 and dyslexic). On the cerebellar tests of postural stability and muscle tone, the non-discrepant group performed significantly better than the…

This study investigated the relationship between categorical perception and dyslexia by comparing the discrimination responses of 19 children with dyslexia and 17 average readers to sinewave analogues of speech sounds presented as either nonspeech whistles or as speech sounds. The study found an increased perceptibility of within-category…

Reviews some of the most pertinent current research on possible causes of dyslexia. Offers guidelines for the prognosis and treatment of dyslexics and literary options for reading teachers and specialists to use in working with dyslexia. (PA)

Investigates the nature of the underlying cognitive deficit in developmental dyslexia. Tests the predictions of two competing hypotheses by examining the status of several phonological and lexical retrieval skills in school-age children and adolescents with reading disability. Concludes that the phonological hypothesis offers a more parsimonious…

This study examined event-related potentials (ERPs) to synthetic consonant-vowel syllables from 26 newborns with familial risk for dyslexia and 23 control infants participating in a longitudinal study of dyslexia. Results indicated that the cortical electric activation evoked by speech elements differed between children with and without risk for…

Italian polysyllabic words with stress falling on the last syllable are written with a diacritic sign on the last vowel. It allows discrimination between two words with the same orthographic segments (e.g., papa [pope], papa [dad]). The effect of the accent mark in left neglect dyslexia has never been investigated. In the current study, six…

Linkage studies of complex phenotypes such as reading ability/disability (developmental dyslexia or reading disorder) and related componential processes, where the effects attributable to individual genes appear to be modest, are critically dependent on the nature and composition of the samples and the phenotypes analyzed. Thus, it might be…

A word-learning task was used to investigate variation among developmental dyslexics classified as phonological and surface dyslexics. Dyslexic children and chronological age (CA)- and reading level (RL)-matched normal readers were taught to pronounce novel nonsense words such as "veep." Words were assigned either a regular (e.g., ''veep'') or an…

For 25 years now, there has been a serious attempt to get at the fundamental cause(s) of dyslexia in our laboratory. A great deal of research has been carried out on the psychological and brain underpinnings of the linguistic dysfunctions seen in dyslexia, but attempts to get at its cause have been limited. Initially, observations were made on the…

A number of studies reported that developmental dyslexics are impaired in speech perception, especially for speech signals consisting of rapid auditory transitions. These studies mostly made use of a categorical-perception task with synthetic-speech samples. In this study, we show that deficits in the perception of synthetic speech do not…