This paper argues why children with Mathematical Learning Disabilities (MLD) do not form a unitary group. Instead, they should be regarded as individuals with unique profiles of strengths and weaknesses that explain their mathematical difficulties. To build this argument, we shortly recapitulate the research on MLD, which has mainly been focused…

The overarching goal of the new Florida State University/Haskins Laboratory/University of Connecticut Learning Disability (LD) Hub project is to align computational and behavioral theories of individual word reading development more closely with the challenges of learning to read a quasi-regular orthography (i.e., English) for both typically…

In the present study we examined whether children with Developmental Dyscalculia (DD) exhibit a deficit in the so-called "Approximate Number System" (ANS). To do so, we examined a group of elementary school children who demonstrated persistent low math achievement over 4 years and compared them to typically developing (TD), aged-matched…

In honor of Dr. Katherine Butler's extraordinary leadership of "Topics in Language Disorders," this article takes up her 1982 challenge to reach toward greater understanding of individual differences in the use of oral and written language by children with language learning disability. The article focuses on 3 interconnected dimensions of learning…

Although shyness has often been found to be negatively related to vocabulary, few studies have examined the processes that produce or modify this relation. The present study examined executive functioning skills and home environmental stimulation as potential mediating and moderating mechanisms. A sample of 3 1/2-year-old children (N = 254) was…

Dot enumeration (DE) and number comparison (NC) abilities are considered markers of core number competence. Differences in DE/NC reaction time (RT) signatures are thought to distinguish between typical and atypical number development. Whether a child's DE and NC signatures change or remain stable over time, relative to other developmental…

This introductory article briefly describes each of the following eight articles in this special issue on the neurology and genetics of learning related disorders. It notes the greater appreciation of learning disability as a set of complex disorders with broad and intricate neurological bases and of the large individual differences in how these…

Individual growth curves were used to test whether the development of children with reading disabilities is best characterized by models of developmental lag or developmental deficit. Results with 403 children suggest that the developmental course of reading disabilities is best characterized by deficit models. (SLD)

The discrepancy between middle-class and lower-class children's performance on IQ tests has been thought of as "cognitive deficit" or as "cognitive differences." This paper proposes another explanation--cognitive lag hypothesis--according to which the low IQ test scores of lower-class children are seen as due to the developmentally delayed…

This article presents an overview of some methods and results from our continuing studies of genetic and environmental influences on dyslexia, and on individual differences across the normal range that have been conducted over the past 25 years in the Colorado Learning Disabilities Research Center (CLDRC) and in related projects. CLDRC…

Investigated the utility of profile analysis, using the Wechsler Intelligence Scale for Children--Revised (WISC--R) to differentiate learning disabled from emotionally disturbed and nonhandicapped children. Little evidence supported the use of WISC--R subtest scatter. Research efforts focused on WISC--R subtests related to the learning process are…

Three experiments involving 85 learning-disabled (LD) children and 101 non-LD children investigated whether memory difficulties of LD children may be attributable in part to executive processing. Results suggest that LD readers may suffer from executive processing deficiencies, although they do not rule out effects of language-specific processes.…

Assesses the relationship of Wide Range Assessment of Memory and Learning scores to Wechsler Intelligence Scale for Children II and Woodcock-Johnson-Revised results in three groups: (1) learning disabled children with reading difficulties; (2) attention deficit hyperactivity disorder children; and (3) nonhandicapped referred children. Total sample…

TWO SPEECHES PRESENTED AT THE THIRD ANNUAL SYMPOSIUM HELD BY RUTGERS STATE UNIVERSITY IN 1967 CONSIDER LEARNING DISABILITIES. IN "NEUROPHRENIC CHILDREN--THEIR EARLY IDENTIFICATION AND MANAGEMENT," EDGAR A. DOLL EXPLAINS HIS CONCEPT OF NEUROPHRENIA AND THE IMPORTANCE OF EARLY IDENTIFICATION AND DISCUSSES THE USE OF THE VINELAND SOCIAL MATURITY…