Abstract:
:Impulsive behavior in heroin-dependent individuals and matched smokers was studied within the framework of temporal discounting. Two well-known effects were examined: the sign and magnitude effects (Kirby, 1997). The study also investigated the relationship between cognitive impulsivity and inhibitory control as measured by a Go/No-go task. Fifty-six heroin-dependent patients in the postmethadone treatment stage and an equal number of matched daily smokers participated in the study. The heroin-dependent patients showed higher discount rates in both gain and loss conditions. They also showed no sign effect by demonstrating similar discount rates in gains and losses. Heroin-dependent patients also exhibited a magnitude effect, which was weaker than that observed in smokers. Differential relationships between impulsivity and inhibitory control were found in the two groups. For smokers, decision-making and inhibitory control behaviors pertained to different psychological processes, whereas for heroin-dependent patients, the two behaviors were partially related. Finally, a significant correlation between length of heroin use and temporal discounting with small magnitude was found. The present study advances our understanding of the specific behavioral impulsive patterns in heroin-dependent individuals.
journal_name
Exp Clin Psychopharmacoljournal_title
Experimental and clinical psychopharmacologyauthors
Cheng J,Lu Y,Han X,González-Vallejo C,Sui Ndoi
10.1037/a0029657subject
Has Abstractpub_date
2012-10-01 00:00:00pages
400-9issue
5eissn
1064-1297issn
1936-2293pii
2012-21980-001journal_volume
20pub_type
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