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Temporal dynamics of musical emotions examined through intersubject synchrony of brain activity.

机译:通过大脑活动的主体间同步来检验音乐情绪的时间动态。

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摘要

To study emotional reactions to music, it is important to consider the temporal dynamics of both affective responses and underlying brain activity. Here, we investigated emotions induced by music using functional magnetic resonance imaging (fMRI) with a data-driven approach based on intersubject correlations (ISC). This method allowed us to identify moments in the music that produced similar brain activity (i.e. synchrony) among listeners under relatively natural listening conditions. Continuous ratings of subjective pleasantness and arousal elicited by the music were also obtained for the music outside of the scanner. Our results reveal synchronous activations in left amygdala, left insula and right caudate nucleus that were associated with higher arousal, whereas positive valence ratings correlated with decreases in amygdala and caudate activity. Additional analyses showed that synchronous amygdala responses were driven by energy-related features in the music such as root mean square and dissonance, while synchrony in insula was additionally sensitive to acoustic event density. Intersubject synchrony also occurred in the left nucleus accumbens, a region critically implicated in reward processing. Our study demonstrates the feasibility and usefulness of an approach based on ISC to explore the temporal dynamics of music perception and emotion in naturalistic conditions.
机译:要研究音乐的情感反应,重要的是要考虑情感反应和潜在的大脑活动的时间动态。在这里,我们使用功能磁共振成像(fMRI)和基于主体间相关性(ISC)的数据驱动方法研究了音乐诱发的情绪。这种方法使我们能够识别在相对自然的聆听条件下听众之间产生相似大脑活动(即同步性)的音乐时刻。对于扫描仪外部的音乐,还获得了由音乐引起的主观愉悦和唤醒的连续评分。我们的研究结果表明,与左脑杏仁核,左岛岛和右尾状核的同步激活有关,这与较高的觉醒有关,而正价数与扁桃体和尾状核活性降低相关。进一步的分析表明,同步扁桃体反应是由音乐中与能量相关的特征(如均方根和不谐和)驱动的,而岛内同步对声事件密度也很敏感。主体间同步也发生在左伏伏核中,该区域在奖励处理中至关重要。我们的研究证明了基于ISC的方法在自然条件下探索音乐感知和情感的时间动态的可行性和实用性。

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