Institute for Brain, Cognition and Behavior, University of Barcelona, Catalonia, Spain.
Biol Psychol. 2012 Mar;89(3):545-52. doi: 10.1016/j.biopsycho.2011.12.014. Epub 2011 Dec 31.
Based on the previous study where phase-synchronization (PS) of gamma-band responses (GBRs) proved a reliable cerebral correlate of involuntary attention and its enhancement under threat, we measured gamma-PS elicited by novel sounds from human electroencephalogram (EEG) scalp-recordings when participants responded to visual stimuli displaying either highly motivational or neutral sceneries. We then tested the modulatory effect of the emotional conditions on auditory responses. Novel distractor sounds did not affect behavioural accuracy on subjects' visual task performance in neutral context but markedly decreased hit rate in the appetitive one. Similarly, gamma-PS to novel sounds remained intact in neutral context, whereas it showed an increase, within the 35-Hz sub-range, in the appetitive context. These results suggest that a context of processing positive emotional stimuli results into an enhanced processing of task-irrelevant novel auditory events, and, furthermore, that gamma-PS is tuned under conditions that could promote long-term survival.
基于先前的研究，伽马波段响应（GBRs）的相位同步（PS）被证明是无意识注意的可靠大脑相关物，并且在受到威胁时会增强，我们通过人类脑电图（EEG）头皮记录来测量由新声音引起的伽马 PS，当参与者对显示高度动机或中性场景的视觉刺激做出反应时。然后，我们测试了情绪条件对听觉反应的调制作用。在中性情境下，新的分心声音不会影响被试在视觉任务中的行为准确性，但在有吸引力的情境中明显降低了击中率。同样，在中性情境下，新声音的伽马 PS 保持不变，而在有吸引力的情境下，伽马 PS 在 35-Hz 子范围内增加。这些结果表明，处理正性情绪刺激的语境会导致对任务无关的新听觉事件的处理增强，此外，伽马 PS 会根据可能促进长期生存的条件进行调整。
