Load effects in auditory selective attention: evidence for distinct facilitation and inhibition mechanisms.
Load effects in auditory selective attention: evidence for distinct facilitation and inhibition mechanisms.
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DOI：
10.1016/j.neuroimage.2009.12.039
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发表时间：
2010-03
期刊：
影响因子：
5.7
通讯作者：
Knight, Robert T.
中科院分区：
文献类型：
--
作者：
Bidet-Caulet, Aurelie;Mikyska, Constanze;Knight, Robert T.
刺激加工的易化和抑制是否代表听觉注意的一种或两种机制尚不清楚。我们在人类身上进行了电生理实验，以解决这两个相互竞争的假设。受试者在低或高记忆负荷下执行注意任务。通过记录对被关注和被忽略的声音的电生理反应，并将其与当注意力被认为均匀分布于所有声音时对这些相同声音的反应进行比较，来测量促进和抑制。我们观察到两个迟来的前端分布的组件：一个负的一个在响应出席的声音，和一个积极的忽略的声音。这两个正面分布的反应有不同的时间和头皮地形，并受到不同的记忆负荷。总之，这些结果提供的证据表明，注意介导的自上而下的控制反映了不同的促进和抑制机制的活动。
It is unknown whether facilitation and inhibition of stimulus processing represent one or two mechanisms in auditory attention. We performed electrophysiological experiments in humans to address these two competing hypothesis. Participants performed an attention task under low or high memory load. Facilitation and inhibition were measured by recording electrophysiological responses to attended and ignored sounds and comparing them to responses to these same sounds when attention was considered to be equally distributed towards all sounds. We observed two late frontally distributed components: a negative one in response to attended sounds, and a positive one to ignored sounds. These two frontally distributed responses had distinct timing and scalp topographies and were differentially affected by memory load. Taken together these results provide evidence that attention-mediated top-down control reflects the activity of distinct facilitation and inhibition mechanisms.
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