Reviews some findings obtained through comparisons of dyslexic readers with nondyslexic readers matched by chronological or reading age. Notes some of the problems and pitfalls associated with this approach. Explores the potential of other group comparisons when examining sources of reading difficulty, and discusses individual differences within…

Discusses (1) the process of early language development, giving specific attention to problematic aspects of a vocabulary for audition; (2) elicitation and instruction tasks used in the study of language acquisition; and (3) an investigation designed to compare language acquisition for dimensions of visual, spatial, and tactual perception with…

Nonretarded (NR) and educable mentally retarded (EMR) 6- to 19-year-old children in Istanbul, Turkey, completed conservation tasks. Found a similarity in the developmental progression of conservation concepts between the two groups and between these groups and groups of NR and EMR children in England as reported in previous studies. (BC)