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Skagerlund, Kenny; Träff, Ulf – Journal of Learning Disabilities, 2016
This study investigated if developmental dyscalculia (DD) in children with different profiles of mathematical deficits has the same or different cognitive origins. The defective approximate number system hypothesis and the access deficit hypothesis were tested using two different groups of children with DD (11-13 years old): a group with…
Descriptors: Learning Disabilities, Cognitive Ability, Number Concepts, Mathematics Skills
Kaufman, James C., Ed. – Cambridge University Press, 2009
The field of intelligence testing has been revolutionized by Alan S. Kaufman. He developed the Wechsler Intelligence Scale for Children-Revised (WISC-R) with David Wechsler, and his best-selling book, Intelligent Testing with the WISC-R, introduced the phrase "intelligent testing." Kaufman, with his wife, Nadeen, then created his own…
Descriptors: Foreign Countries, Intelligence, Learning Disabilities, Testing
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Ingesson, S. Gunnel – Dyslexia, 2006
A follow-up study was performed to investigate the stability of IQ measures in a group of dyslexic teenagers and young adults. Earlier research had shown contradictory results. The 65 subjects, 12 years old on the average at first test, were retested after a mean interval of six and a half years. There was a significant relative decrease in…
Descriptors: Learning Disabilities, Dyslexia, Intelligence Tests, Intelligence Quotient