Research into reading development and reading disabilities has been dominated by phonologically guided theories for several decades. In this volume, the authors of 11 chapters report on a wide array of current research topics, examining the scope, limits and implications of a phonological theory. The chapters are organized in four sections. The…

This study investigated the role of the myelin oligodendrocye glycoportein (MOG) gene to reading disability in 22 children with dyslexia and 96 random controls. Results suggest that, although alleles in the MOG gene may be in linkage disequilibrium with a locus that contributes to reading disability, the MOG gene itself is probably not involved.…

Phonology has been a central concept in the scientific study of dyslexia over the past decades. Despite its central position, however, it is a concept with no precise definition or status. The present article investigates the notion of "phonology" in the tradition of cognitive psychology. An attempt is made to characterize the basic assumptions of…

The test-retest reliability of colored filter testing in relation to two symptom levels of dyslexia was evaluated using a forced-choice test procedure. Two tests, separated by two weeks, were conducted with 41 participants (ages 15 to 17). Results indicated poor test-retest reliability. (Author/DB)

Genetic research has shown that dyslexia is familial, substantially heritable, and heterogeneous in its genetic mechanisms. Evidence also supports the view that the primary symptom in dyslexia is a deficit in the phonological coding of written language, a symptom that appears to be heritable. (Author/JDD)

In an effort to explore S. Orton's "intergrading" hypothesis, six developmental dyslexics (ages 16 to 47) and four good readers were tested on measures of interhemispheric coordination. Dyslexics showed reduced laterality bias and longer response latencies to bihemifield stimuli. (Author/DB)

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…

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…

Recognizing the apparently successful application of the modality preference approach to beginning reading in actual practice, the failure of research to support this approach is analyzed. Identified as problem areas in the research methodology are test instrument reliabilty, comparability of the teaching component to classroom instruction, nature…

"Sine-wave speech" sentences contain only four frequency-modulated sine waves, lacking many acoustic cues present in natural speech. Adults with (n=19) and without (n=14) dyslexia were asked to reproduce orally sine-wave utterances in successive trials. Results suggest comprehension of sine-wave sentences is impaired in some adults with…

This study evaluated the effect of sound-symbol association training on visual and phonological memory in children (n=24) with a history of dyslexia. Comparison with controls matched for either age or reading level found children with dyslexia or whose dyslexia had been compensated demonstrated a variety of visual and phonological memory deficits,…

The exploratory study examined patterns of regional cerebral blood flow in a surface and a deep dyslexic during reading. Significant differences in gray matter blood flow were found between subjects and normal controls. Also differences existed between the surface and deep dyslexic in the distribution of cortical perfusion. (Author/DB)

The study compared the temporal organization of motor speech in dyslexic adolescents and adults without overt speech difficulties (N=91), matched normal readers, and learning-disabled adolescents (N=50) without reading difficulties. Dyslexic subjects showed more evidence of motor speech deficits than did subjects in either control group. (DB)

Fourteen Dutch children with dyslexia were compared with controls on automatic processing under a dual task (motor balance task and auditory choice task) model. Results indicated the dyslexic group was more impaired in the dual task condition than in the single task condition, compared with controls. Findings support the automatization deficit…

This article reviews medical case study research from the United Kingdom, Germany, and the United States that identified characteristics, etiological factors, and treatment methods of reading disorders. It also addresses the validity of case study research from an historic and current-day perspective. (Contains references.) (Author/DB)