Processing of Expected and Unexpected Monetary Performance Outcomes in Healthy Older Subjects
Processing of Expected and Unexpected Monetary Performance Outcomes in Healthy Older Subjects
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DOI：
10.1037/a0022536
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发表时间：
2011-04-01
影响因子：
1.9
通讯作者：
Daum, Irene
中科院分区：
文献类型：
--
作者：
Bellebaum, Christian;Kobza, Stefan;Daum, Irene
反馈相关负波(FRN)是一种反映前扣带回(ACC)反馈处理的事件相关电位(ERP)成分，一直以来都被发现在健康衰老中减少，而关于年龄相关决策变化和基于反馈的学习的行为研究结果并不一致。本研究旨在阐明健康被试、年轻被试和年长被试在货币绩效反馈加工过程中的异同，重点是奖励期望的影响。18名年轻的受试者和20名年长的受试者完成了一项反馈学习任务，在这项任务中，可以学习一条规则来预测与特定刺激相关的奖励概率。年龄较大的受试者表现出学习速度比年轻受试者慢的证据。在年轻和年长的受试者中，由于负反馈事件相关电位的调节，对于意想不到的结果，FRN时间窗口中无奖赏和奖赏之间的幅度差异更大。与之前的发现一致，在年长的受试者中，幅度差异通常会减小。两组奖赏P300波幅均大于非奖赏P300波幅，效价与概率交互作用表明，只有奖赏P300受期望的调节。尽管健康老年人的结果相关事件相关事件相关电位总体上发生了变化，但年长的受试者显示出预期对货币反馈加工的保留效应。
The feedback-related negativity (FRN), an event-related potential (ERP) component reflecting feedback processing in the anterior cingulate cortex (ACC), has consistently been found to be reduced in healthy aging, whereas behavioral findings regarding age-related changes in decision making and feedback-based learning are inconsistent. This study aimed to elucidate similarities and differences between healthy younger and older subjects in the processing of monetary performance feedback focusing on effects of reward expectancy. Eighteen younger and 20 older subjects completed a feedback learning task, in which a rule could be learned to predict the reward probabilities associated with particular stimuli. Older subjects showed evidence of slower learning than younger subjects. In both younger and older subjects, the amplitude difference between nonreward and reward in the FRN time window was larger for unexpected than expected outcomes, driven by modulations of negative feedback ERPs. Consistent with previous findings, the amplitude difference tended to be generally reduced in older subjects. P300 amplitude was larger for reward than nonreward in both groups, and interactions between valence and probability indicated that only the P300 for reward was modulated by expectancy. Despite general changes of outcome-related ERPs in healthy aging, older subjects show evidence of preserved effects of expectancy on the processing of monetary feedback.