INTELLIGENCE AND INSPECTION TIME - ACHIEVEMENTS, PROSPECTS, AND PROBLEMS

The purpose of this article is to introduce the inspection-time measur e to the wider psychological community. Inspection time is, to date, t he only single information-processing index that accounts for approxim ately 20% of intelligence-test variance. We argue that inspection time , because of its much-replicated correlation with IQ and its potential for theoretical tractability, has more potential for our understandin g of individual differences in cognitive ability than other indexes of human information processing. The nature of inspection time and its m easurement are described, studies correlating inspection time and IQ-t ype test scores are summarized, and the difficulties of explaining thi s correlation are highlighted.