Frontal brain asymmetry and reward responsiveness - A source-localization study
Frontal brain asymmetry and reward responsiveness - A source-localization study
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DOI：
10.1111/j.1467-9280.2005.01618.x
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发表时间：
2005-10-01
影响因子：
8.2
通讯作者：
Davidson, RJ
中科院分区：
文献类型：
--
作者：
Pizzagalli, DA;Sherwood, RJ;Davidson, RJ
接近和回避倾向对情绪、推理和行为的影响引起了心理学各个领域的研究者的极大兴趣。目前，额叶脑电(EEG)的不对称性有利于左侧前额叶区域，被认为反映了与入路相关的倾向反应的倾向。为了验证这一假设，我们记录了18名受试者的静态脑电，这些受试者分别在三种激励条件(中性、奖励和惩罚)下完成了一项言语记忆任务。使用来源定位技术，我们发现在左侧背外侧前额叶和内侧眼眶额区，较高的任务无关α2(10.5-12赫兹)活动与较强的对奖赏相关线索的反应倾向有关。左侧前额叶静息活动可解释奖赏偏向变异的54.8%。这些发现不仅证实了额部脑电的不对称性调节了参与食欲动机行为的倾向，而且还提供了关于潜在大脑系统的解剖学细节。
The influence of approach and avoidance tendencies on affect, reasoning, and behavior has attracted substantial interest from researchers across various areas of psychology. Currently, frontal electroencephalographic (EEG) asymmetry in favor of left prefrontal regions is assumed to reflect the propensity to respond with approach-related tendencies. To test this hypothesis, we recorded resting EEG in 18 subjects, who separately performed a verbal memory task under three incentive conditions (neutral, reward, and punishment). Using a source-localization technique, we found that higher task-independent alpha2 (10.5-12 Hz) activity within left dorsolateral prefrontal and medial orbitofrontal regions was associated with stronger bias to respond to reward-related cues. Left prefrontal resting activity accounted for 54.8% of the variance in reward bias. These findings not only confirm that frontal EEG asymmetry modulates the propensity to engage in appetitively motivated behavior, but also provide anatomical details about the underlying brain systems.