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Exp Clin Psychopharmacol. 2003 Feb;11(1):18-25.

Impulsivity and rapid discounting of delayed hypothetical rewards in cocaine-dependent individuals.

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Department of Psychiatry, University at Buffalo, State University of New York, Buffalo General Hosptial, 14203, USA.


In this study, crack/cocaine-dependent (CD) and non-drug-using matched control (MC) participants were presented with hypothetical immediate and delayed rewards, with 16 delay conditions ranging from 5 min to 25 years. All participants were presented with hypothetical monetary rewards; however, the CD group was also presented with hypothetical crack/cocaine rewards. The objective value of the rewards ranged from $1 to $1,000. Hyperbolic discounting functions provided a good fit of the data. The CD group discounted monetary rewards at a higher rate than the MC group did, and the CD group discounted crack/cocaine rewards at a higher rate than it did monetary rewards. Moreover, scores on self-report measures indicated greater impulsivity in the CD group when compared with the MC group.

[Indexed for MEDLINE]

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