Impulsivity and rapid discounting of delayed hypothetical rewards in cocaine-dependent individuals.
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.
Coffey
Scott F
SF
Department of Psychiatry, University at Buffalo, State University of New York, Buffalo General Hosptial, 14203, USA. scoffey@acsu.buffalo.edu
Gudleski
Gregory D
GD
Saladin
Michael E
ME
Brady
Kathleen T
KT
D000328:Adult; D019970:Cocaine-Related Disorders / Q000523:psychology*; D005260:Female; D006801:Humans; D007175:Impulsive Behavior / Q000523:psychology*; D007361:Intelligence Tests; D008297:Male; D009042:Motivation; D011569:Psychiatric Status Rating Scales; D012201:Reward; D011795:Surveys and Questionnaires; D013997:Time Factors