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