Standardized tests are used widely in comparative studies of clinical populations, either as dependent or control variables. Yet, one cannot always be sure that the test items measure the same constructs in the groups under study. In the present work, 460 participants with intellectual disability of undifferentiated etiology and 488 typical…

The relationship between measures of IQ and standardized school achievement tests is well established at around r~0.5 when the two are measured in close proximity. The current paper examined the stability of this correlation when comparing elementary school achievement (grades 3-8) and midlife IQ. Iowa Adoption Study participants who had…

Heim's AH4 Test of General Intelligence, Raven's Advanced Progressive Matrices, and two Piagetian formal operations tests (Shayer's Science Reasoning Tasks and Arlin's Test of Formal Reasoning) were administered to 459 15-year-olds attending Secondary three (grade nine) in Singapore. A hierarchical factor structure was found underlying all of…

The history of the concept of intelligence is reviewed, and the construction and uses of psychological tests are explored. Skills consist of a large number of abilities. It is argued that the psychological entity, intelligence, is determined by particular contexts, contexts often induced by social demands. (SLD)

A measurement and psychometric examination of cognitive tasks was carried out with 195 undergraduates, investigating stability of latencies and number correct scores over a 2-week period and relations with standardized test and ability measure scores. Results are discussed in terms of the need for evaluating cognitive task measurement properties.…