Using cognitive diagnostic modeling (CDM), this study identified subtypes of mathematics learning disability (MLD) based on children's numerical skills and examined the language and spatial precursors of these subtypes. Participants were 99 MLD children and 420 low achievers identified from 1839 Finnish children (966 boys) who were followed from…

To examine whether there are common or specific deficits of reading disability (RD) in first (L1) and second languages (L2), Chinese children (9-11 years, N = 76) with or without RD who learn English as an L2 were studied during a visual word rhyming judgment task. Evidence was found for common deficits in L1 and L2 in visuo-orthographic processes…

Mathematical difficulties have been distinguished as mathematics learning disability (MLD) and persistent low achievement (LA). Based on 1,880 Finnish children who were followed from kindergarten (age 6) to fourth grade, this study examined the early risk factors for MLD and LA. Distinct groups of MLD (6.0% of the sample) and LA (25.7%) children…

Deficits in numerical magnitude perception characterize the mathematics learning disability developmental dyscalculia (DD), but recent studies suggest the relation stems from inhibitory control demands from incongruent visual cues in the nonsymbolic number comparison task. This study investigated the relation among magnitude perception during…

Many children have significant mathematical learning disabilities (MLD, or dyscalculia) despite adequate schooling. The current study hypothesizes that MLD partly results from a deficiency in the Approximate Number System (ANS) that supports nonverbal numerical representations across species and throughout development. In this study of 71 ninth…

Chromosomal microarray analysis (CMA) has emerged as a powerful new tool to identify genomic abnormalities associated with a wide range of developmental disabilities including congenital malformations, cognitive impairment, and behavioral abnormalities. CMA includes array comparative genomic hybridization (CGH) and single nucleotide polymorphism…

Compared the processing of rapid auditory stimuli on two-tone auditory discrimination tasks by 7- to 11-year-olds with learning impairments (LI) and those without learning impairments (non-LI). Found that LI children committed more errors, but the effects of timing were comparable. Obtained same results with a sample of good and poor readers. Task…

A hemispheric specialization of function paradigm was used to test cognitive skill and cognitive style in learning disabled and "normal" boys between the ages of 7 and 12. Discussion emphasizes the need for more information on nonverbal processing skills to aid in developing verbal representational systems. (JMB)

A serial recognition task was used to compare performance of two age groups of learning disabled children (mean chronological ages 8.1 and 10.6) with 2- and 3-dimensional representations of nonlabeled 8-point random shapes. (Author/JMB)

Lexical priming was assessed in children with reading disability (RD) and in age-matched controls (M= 11.5 years), in visual and auditory lexical decision tasks. In the visual task, children with RD were found to have deficits in semantic (SHIP-BOAT), phonological/graphemic (GOAT-BOAT), and combined (FLOAT-BOAT) priming. The same pattern of…

Results obtained from 44 children (ages 7 through 16) with sex chromosome abnormalities and from 17 chromosomally normal siblings demonstrated that children in the former group have an increased risk of encountering learning problems. (MP)

Examined imitation and pantomime abilities in 17 high-functioning adolescents with autism and in 15 comparison subjects with dyslexia or other learning disorders, matched on chronological age and verbal IQ. Found no support for the symbolic deficit hypothesis; meaning aided, rather than hindered, the performance of the group with autism. (MDM)

Comprehensively reviews known examples of genetically influenced learning disabilities and speech and language disorders, including familial dyslexia, stuttering, and other speech and language disorders, as well as sex-chromosome anomalies, treated PKU, and minor auto-somal anomalies. (Author/RH)

The apprehension spans of learning-disabled and normal boys were compared by means of a forced-choice letter-recognition task involving tachistoscopic exposures of letter displays. Results of three experiments indicated that the decreased spans of apprehension observed in the first experiment for learning-disabled boys resulted either from greater…

Using strict and lenient mathematics achievement cutoff scores to define a learning disability, respective groups of children who are math disabled (MLD, n = 15) and low achieving (LA, n = 44) were identified. These groups and a group of typically achieving (TA, n = 46) children were administered a battery of mathematical cognition, working…