MECHANISMS OF IMPULSIVE CHOICE: I. INDIVIDUAL DIFFERENCES IN INTERVAL TIMING AND REWARD PROCESSING
MECHANISMS OF IMPULSIVE CHOICE: I. INDIVIDUAL DIFFERENCES IN INTERVAL TIMING AND REWARD PROCESSING
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DOI：
10.1002/jeab.88
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发表时间：
2014-07-01
影响因子：
2.7
通讯作者：
Kirkpatrick, Kimberly
中科院分区：
文献类型：
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作者：
Marshall, Andrew T.;Smith, Aaron P.;Kirkpatrick, Kimberly
冲动选择行为包含了心理机制，涉及预期的大小和延迟，直到奖励的处理。本实验的目的是确定这些过程中的个体差异是否与冲动选择行为的个体差异有关。两组大鼠（延迟组和幅度组）最初暴露于一个冲动的选择任务之间的选择较小的更快（SS）和较大的更晚（LL）的奖励。延迟组随后接受时间辨别任务，然后接受渐进间隔任务，而幅度组则接受奖励幅度敏感性任务，然后接受渐进比率任务。任务间的相关性表明，大鼠在延迟组，使更多的自我控制（LL）的选择，也显示出较低的标准差，在时间平分任务和更大的延迟容忍的渐进间隔任务。冲动选择行为的幅度组没有表现出任何实质性的相关性与奖励幅度的敏感性和累进比率的任务。研究结果表明，核心计时过程在冲动选择行为中的重要性，并鼓励进一步研究核心计时过程的变化对冲动选择的影响。
Impulsive choice behavior incorporates the psychological mechanisms involved in the processing of the anticipated magnitude and delay until reward. The goal of the present experiment was to determine whether individual differences in such processes related to individual differences in impulsive choice behavior. Two groups of rats (Delay Group and Magnitude Group) were initially exposed to an impulsive choice task with choices between smaller-sooner (SS) and larger-later (LL) rewards. The Delay Group was subsequently exposed to a temporal discrimination task followed by a progressive interval task, whereas the Magnitude Group was exposed to a reward magnitude sensitivity task followed by a progressive ratio task. Intertask correlations revealed that the rats in the Delay Group that made more self-controlled (LL) choices also displayed lower standard deviations in the temporal bisection task and greater delay tolerance in the progressive interval task. Impulsive choice behavior in the Magnitude Group did not display any substantial correlations with the reward magnitude sensitivity and progressive ratio tasks. The results indicate the importance of core timing processes in impulsive choice behavior, and encourage further research examining the effects of changes in core timing processes on impulsive choice.