Researchers across many fields have called for greater attention to heterogeneity of treatment effects--shifting focus from the average effect to variation in effects between different treatments, studies, or subgroups. True heterogeneity is important, but many reports of heterogeneity have proved to be false, non-replicable, or exaggerated. In…

Criticizes the Detroit Tests of Learning Aptitude 2 (DLTA-2): (1) scoring criteria for the Story Construction Test are questionable; (2) the Word Fragment Test may not be practically significant; (3) the Picture Book is inconvenient to use without an index or table of contents. One major strength is the provision for combining subtest scores. (SRT)

The elusive phenomenon of individual learning differences was probed via the concepts of transfer and practice at different stages of the learning process. Order of presentation of two films covering different subjects provided the transfer task. Practice was introduced by five repetitions of the films, interspersed among six repetitions of an…

Examines claims that unconscious second language learning under implicit and incidental conditions is insensitive to measures of individual differences in cognitive abilities, in contrast to learning under conscious rule-search and instructed conditions. Findings revealed that only in the incidental condition was the extent of learning and…