The study was designed to determine the efficacy of the Bannatyne recategorization in differentiating subgroups of learning disabled from emotionally disturbed children. The sample was comprised of 327 male and female Ss who had been placed in special education classes for either the learning disabled or emotionally disturbed. A three factor…

Neural network technology was compared with simultaneous and stepwise linear discriminant analysis in terms of their ability to classify and predict persons (n=138) as having autism or mental retardation. The neural network methodology was superior in both classifying groups and in generalizing to new cases that were not part of the training…

Three types of definitions of learning disabilities (LD) (ability-achievement discrepancy, low achievement, and scatter) were examined to determine the extent of common variance within 48 school-identified LD children and 96 nonLD children (all elementary students). Both samples had previously been administered a battery of psychoeducational…

This paper reviews 20 studies that investigated the internal or external validity of various subtypes of autistic spectrum disorders. At least three groups could be distinguished from autism on clinical grounds: an Asperger syndrome subtype, and two atypical subtypes characterized by either low intelligence quotient or high intelligence quotient.…

This study sought to empirically identify subtype and severity patterns prevalent among learning-disabled adults and apply this information to strategies that rehabilitation counselors could use to improve the probability of job success of their clients. Subjects (n=219) were administered standardized measures of intelligence, achievement, and…

This paper reviews whether Rett syndrome is a subtype of pervasive developmental disorders (PDD). The paper analyzes internal and external diagnostic validity and discusses whether Rett syndrome is a neurological disorder or a mental disorder. The paper concludes that data support the idea of classifying Rett syndrome as a subtype of PDD.…

This paper presents evidence regarding the validity of the diagnostic concept of "autistic-like" childhood disintegrative disorder, also known as Heller syndrome or as disintegrative psychosis. Its inclusion in the DSM-IV (Diagnostic and Statistical Manual) is supported, and proposed criteria and narrative description are provided.…

Evaluation of 252 children with specific language impairments found varying degrees of congruence between clinically identified children and those identified using discrepancy, deficit, and standardized operational criteria. Results suggest that the global concept of a "specific language impairment" may not be a useful concept for either…

This study examined whether children (ages 6-16) diagnosed as having attention deficit disorder with hyperactivity (ADD/H) could be differentiated from those diagnosed as having attention deficit disorder without hyperactivity (ADD/WO), on an anterior-posterior gradient paradigm. It was predicted that ADD/H children (N=23) would have more deficits…

Identification, differential diagnosis, and treatment evaluation of emotionally disturbed preschoolers by practitioners are considered. Emphasis is on the need for defining disorders in terms of: (1) a broad normative context to assist general reporting within the profession; and (2) specific settings to provide the information necessary for…

This study compared DSM-III-R (Diagnostic and Statistical Manual III, Revised), Childhood Autism Rating Scale, and clinical diagnoses of 138 admissions to a program for diagnosis and treatment of autistic and related communication-handicapped individuals. Results indicated generally high agreement on the diagnosis of autism, with DSM-III-R…

This paper assesses to what extent the ICD-10 (International Classification of Diseases) criteria differ from other diagnostic systems for Asperger syndrome. The paper concludes that the variety of criteria in use makes interpretation of research findings difficult and that the ICD-10 criteria are the most stringent and closest to Hans Asperger's…

This study assessed the nonspeech behaviors associated with young stutterers (n=30, mean age 54 months) and normally fluent children's comparable fluent utterances. Findings suggested that children can be classified as stutterers on the basis of their nonspeech behaviors, which may reflect cognitive, emotional, linguistic, and physical events…

The construct validity of Boder's typology of dyslexia was investigated using quantified electroencephalography with 39 children (ages 7-11) during a reading task and at rest. Results supported beta frequency differences in anticipated regions by dyslexia subtype during the reading task. However, the direction of difference hypothesis was not…

This article reviews recent research on phonological development and characteristics associated with different forms of delay. Language-delayed students are considered categorizable at 24 months as either "late talkers" with no major deviations from patterns of normal acquisition or disordered students whose developmental patterns are markedly…