Push-pull competition between bottom-up and top-down auditory attention to natural soundscapes
Push-pull competition between bottom-up and top-down auditory attention to natural soundscapes
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DOI：
10.7554/elife.52984
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发表时间：
2020-03-20
期刊：
影响因子：
7.7
通讯作者：
Elhilali, Mounya
中科院分区：
文献类型：
--
作者：
Huang, Nicholas;Elhilali, Mounya
在日常的社会环境中，对注意力资源的需求会动态地转移，以平衡我们对感兴趣的目标的注意力，同时提醒我们注意周围的重要物体。本研究利用脑电图技术探讨了自上而下和自下而上注意之间的推拉交互作用在动态听觉场景中的表现。研究人员发现，当被试听有节奏的受控声音序列时，使用自然声景作为干扰物，背景场景中的显著事件显著抑制了对参与序列的锁相和伽马反应，抵消了对参与目标所观察到的增强效应。根据注意力资源有限的假设，自下而上的注意力对神经活动的调节是根据环境事件的显著程度来分级的。该研究还提供了自然声景中内源性和外源性注意之间相互作用的见解，这两种形式的注意在不同的时间滞后下参与一个共同的额顶叶网络。
In everyday social environments, demands on attentional resources dynamically shift to balance our attention to targets of interest while alerting us to important objects in our surrounds. The current study uses electroencephalography to explore how the push-pull interaction between top-down and bottom-up attention manifests itself in dynamic auditory scenes. Using natural soundscapes as distractors while subjects attend to a controlled rhythmic sound sequence, we find that salient events in background scenes significantly suppress phase-locking and gamma responses to the attended sequence, countering enhancement effects observed for attended targets. In line with a hypothesis of limited attentional resources, the modulation of neural activity by bottom-up attention is graded by degree of salience of ambient events. The study also provides insights into the interplay between endogenous and exogenous attention during natural soundscapes, with both forms of attention engaging a common fronto-parietal network at different time lags.