Abstract
Impulsivity is a stable correlate throughout the course of drug addiction. However, it has always been studied as a negative condition, linked to psychopathology. Dickman (1990) proposed two subdimensions of impulsivity, dysfunctional (DI) and functional (FI). He defines the latter as the tendency for rapid, goal-oriented decision-making characterized by well calculated risks. Only a few studies have attempted to differentiate between these two subdimensions using classical neuropsychological tests. Fifty two drug addicts in treatment were tested using Dickman's Impulsivity Inventory and a battery of classical neuropsychological tests. FI shows moderate to high correlations with many classical neuropsychological test scores in relation to enhanced executive functioning, whereas DI reveals surprisingly weak and scarce correlations with indicators of impaired executive functioning. DI appears to be a trait related to some difficulties in classical neuropsychological tests, while FI emerges as a consistent and much stronger predictor of higher attention capacity, lower distractibility, better precision, fewer errors, and better maintenance of goal-oriented strategies. Thus, functional impulsivity is related to positive conditions and more efficient cognitive functioning. Implications for the treatment of drug addictions are suggested.
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