Volume 5, Issue 2 (Summer 2003)                   2003, 5(2): 46-55 | Back to browse issues page

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Ekhtiari H, Behzadi A, Jannati A, Moghimi A. Delayed Discounting Procedure and Impulsive Behaviors: A Preliminary Study. Advances in Cognitive Science. 2003; 5 (2) :46-55
URL: http://icssjournal.ir/article-1-186-en.html
Abstract:   (594 Views)
Objective: Delayed Discounting Procedure (DDP) is defined as discounting of the value related to a reward or punishment due to a delay in their presentation. This procedure, as one of the infrastructural processes underlying riskful decision making, plays a significant role in neuropsychological basis of several psychiatric disorders. Here, in the first DDP study in Iran, a Persian computerized DDP task with standard logic was used.
Method: In this study, 100 students (75 males) chose between receiving 100,000 Toomans after a constant delay and immediate receiving of a decreasing amount of reward in eight consecutive stages. The duration of delays in these stages included 6 hours, one day, one week, two months, 6 months, one year, 5 years, and 25 years. The mean indifference points (in Toomans) among subjects were measured for these delays which were 96280, 94357, 90397, 80750, 68862, 55608, 33350 and 14308 respectively.
Results: There was no significant difference between male and female subjects. Nonlinear regression analysis of our results showed that the hyperbolic function could better explain the DDP function than the exponential function. Applying A/(1+KD) logic to all of the subjects, we found k = 0.060 and r^2 = 0.9334, which reached near 0.98 after increasing the power of variable s in the denominator.
Conclusion: The amount of delayed discounting of reward in our study is higher in comparison to the western studies (on 1000 $) which may be influenced by higher interest rate, economical instabilities, being distrustful among subjects regarding the paying of reward in next several years, and higher value of 1000 $ in western societies compared to the value of 100,000 Toomans for an Iranian subject.
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Type of Study: Research | Subject: Special
Received: 2003/02/20 | Accepted: 2003/04/21 | Published: 2003/06/22

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