The role of beta-gamma oscillations in unexpected rewards processing
The role of beta-gamma oscillations in unexpected rewards processing
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DOI：
10.1016/j.neuroimage.2012.01.125
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发表时间：
2012-04-15
期刊：
影响因子：
5.7
通讯作者：
Marco-Pallares, Josep
中科院分区：
文献类型：
--
作者：
HajiHosseini, Azadeh;Rodriguez-Fornells, Antoni;Marco-Pallares, Josep
人类的奖励处理是由一个广泛的额皮层下网络来完成的，这个网络可能是由快速振荡的电活动来协调的。先前的研究已经发现，在处理正反馈刺激后，β - γ振荡活动增加，但这种脑电图（EEG）相关的功能作用尚不清楚。在本研究中，我们使用事件相关脑电位（ERPs）和基于逐次小波的脑电信号时频分析来研究赌博任务中与金钱收益和损失相关的正反馈和负反馈的期望和大小的影响。只有在意想不到的货币收益中，才会观察到β - γ振荡活动的大幅增加，而不管其幅度如何。基于最近的研究结果，我们提出β - γ振荡活动的增加可能反映了一种基于反馈处理的负责监测意外积极事件的一般认知机制。(C) 2012爱思唯尔公司版权所有。
Reward processing in humans is carried out by an extensive fronto-subcortical network that might be coordinated by fast oscillatory electrical activity. Previous studies have identified an increase in beta-gamma oscillatory activity after the processing of positive feedback stimuli but the functional role of this electroencephalographic (EEG) correlate remains unclear. In the present study, we used event-related brain potentials (ERPs) and trial-by-trial wavelet-based time-frequency analysis of the EEG signal to investigate the effects of expectancy and magnitude of positive and negative feedbacks associated with monetary gains and losses in a gambling task. Large increase of beta-gamma oscillatory activity only in unexpected monetary gains was observed, irrespective of its magnitude. Based on recent findings we propose that this increase in betagamma oscillatory activity might reflect a general cognitive mechanism in charge of monitoring unexpected positive events based on feedback processing. (C) 2012 Elsevier Inc. All rights reserved.