Field Dependence, Cognitive Functions, Personality Traits, and Social Values in Heavy Cannabis Users and Nonuser Controls

Abstract

The current study replicated a previous one concerned with relations of chronic marijuana use, cognitive functioning, personality traits, and social values. A larger sample of subjects was used and several additional measures designed to assess field dependence were also administered. 24 heavy cannabis users were more field independent and had better control of attention processes than 24 nonusers. They also performed slightly better on tasks designed to measure originality, cognitive flexibility, and general cognitive functioning. There was no evidence of brain damage or impaired cognitive functioning. Most previously noted differences having to do with personality and social values were replicated, although some failed to reach significance in the current study. Implications of both studies are discussed, with special reference to self-selection.