ABSTRACT
Intelligence As an introduction to a chapter describing the assessment of premorbid intelligence, a few comments on the question of intelligence per se are needed. Intelligence comprises many different abilities and, as such, the majority of approaches to assessment comprise sets of different tasks, both verbal and performance related. The most widely used measures are the Wechsler Intelligence Scales (Wechsler, 1981) which have gone through periodic revisions since their introduction. Single-scale measures of intelligence such as the Raven’s Progressive Matrices (Raven, 1996) are used less frequently, although in certain circumstances they may be preferred.
