SHORTENED TIME HORIZONS AND INSENSITIVITY TO FUTURE CONSEQUENCES IN HEROIN-ADDICTS

Aims. To investigate whether heroin addicts demonstrate shortened time horizons and decreased sensitivity to future consequences of their be havior compared to non-drug users. Design Setting and Participants. Th irty-four heroin addicts enrolled in a buprenorphine treatment clinic and 59 non-drug-using controls completed a personality questionnaire a nd two laboratory tasks. Measurements. The Stanford Time Perception In ventory (STPI) personality questionnaire assessed orientation to the f uture, and the Future Time Perspective (FTP) task elicited predictions of the timing and ordering of future events. The Bechara card task me asured preferences for decks of cards that range in magnitude and prob ability of delayed and immediate rewards and punishers. Findings. Hero in addicts scored significantly lower than controls on the STPI scale indicative of future orientation. In the FTP, heroin addicts were less likely to predict events far into the future and less likely to syste matically organize events in the future. In the card task, heroin addi cts were less likely to win money than controls. They were more likely to play fr om a deck that contained greater immediate gains but that resulted in large, delayed punishers and overall net losses. They also made fewer selections from a deck that provided an overall net gain v ia relatively low immediate rewards and frequent small punishments. Co nclusions. Shortened rime horizons and decreased sensitivity to delaye d consequences may explain drug abusers' persistent use of drugs, desp ite the long-term negative consequences associated with drug use.