Numerous studies have tried to identify the core deficit of developmental dyscalculia (DD), mainly by assessing a possible deficit of the mental representation of numerical magnitude. Research in healthy adults has shown that numerosity, duration, and space share a partly common system of magnitude processing and representation. However, in DD,…

The present study is the first to examine the computation estimation skills of dyscalculics versus controls using the estimation comparison task. In this task, participants judged whether an estimated answer to a multidigit multiplication problem was larger or smaller than a given reference number. While dyscalculics were less accurate than…

The purpose of this study was to examine and compare the classification accuracy of early static prereading measures and early dynamic assessment reading measures administered to 600 kindergarten students. At the beginning of kindergarten, all of the participants were administered two commonly used static prereading measures. The participants were…

Although behavioral difficulties are well documented in reading disabilities, little is known about the relationship between math ability and internalizing and externalizing behaviors. Here, we use standardized measures to investigate the relation among early math ability, math anxiety, and internalizing and externalizing behaviors in a group of…

The present study evaluated the stability of math learning difficulties over a 2-year period and investigated several factors that might influence this stability (categorical vs. continuous change, liberal vs. conservative cut point, broad vs. specific math assessment); the prediction of math performance over time and by performance level was also…

The majority of work on the double-deficit hypothesis (DDH) of dyslexia has been done at the letter and word levels of reading. Key research questions addressed in this study are (a) do readers with different subtypes of dyslexia display differences in fluency at particular reading levels (e.g., letter, word, and connected text)? and (b) do…

Assessment of 60 children (ages 9-15) with learning disabilities resulted in a group with relatively intact visual planning and mental flexibility skills and a group clearly dysfunctional in these areas. Comparison of the two subtypes on measures of academic skills, visual memory, visual-motor integration, and motor speed indicated significant…

A comparison of cognitive, academic, and linguistic profiles for 74 learning-disabled students and 37 nondisabled college students found significant differences in reading, writing, listening, and speaking achievement. No significant differences were found for gender or Verbal-Performance split in cognitive ability. Instruments used showed similar…

A three-year study found that children with learning disabilities displayed a persistent pattern of maladaptive classroom behavior that distinguished them from average achievers and was associated with continued underachievement, especially for attention and conduct problem subtypes. The developmental relationship between learning disabilities,…