Evidence against attentional state modulating scalp-recorded auditory brainstem steady-state responses.
Evidence against attentional state modulating scalp-recorded auditory brainstem steady-state responses.
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DOI：
10.1016/j.brainres.2015.06.038
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发表时间：
2015-11-11
期刊：
影响因子：
2.9
通讯作者：
Shinn-Cunningham BG
中科院分区：
文献类型：
--
作者：
Varghese L;Bharadwaj HM;Shinn-Cunningham BG
听觉脑干反应（abr）及其稳态对应反应（皮层下稳态反应，SSSRs）通常被认为对认知需求不敏感。然而，少数研究报告称，sssr是根据受试者的注意力焦点来调节的，要么靠近听觉刺激，要么远离听觉刺激。在这里，我们探讨了注意焦点是否会影响包膜跟随反应（EFR），这是一种特殊的SSSR，如果是这样，那么这种影响是特定于被试所关注的声音混合中的声音元素（选择性听觉注意调制），特定于被试所关注的感觉输入（多模态注意调制），还是对注意焦点不敏感。我们比较了人类听者在不同任务下的efr刺激相位锁定强度：听单耳刺激，在双耳刺激呈现时选择性地关注特定的耳朵，以及在忽略双耳听觉输入的情况下关注视觉刺激。我们观察到在实验操作中EFR没有系统的变化，即使皮质脑电图显示在任务中与注意力相关的α活动调节。我们的结论是，注意效应，如果有的话，对人类皮层下声音表征不能用efr稳健地观察到。
Auditory brainstem responses (ABRs) and their steady-state counterpart (subcortical steady-state responses, SSSRs) are generally thought to be insensitive to cognitive demands. However, a handful of studies report that SSSRs are modulated depending on the subject’s focus of attention, either towards or away from an auditory stimulus. Here, we explored whether attentional focus affects the envelope-following response (EFR), which is a particular kind of SSSR, and if so, whether the effects are specific to which sound elements in a sound mixture a subject is attending (selective auditory attentional modulation), specific to attended sensory input (inter-modal attentional modulation), or insensitive to attentional focus. We compared the strength of EFR-stimulus phase locking in human listeners under various tasks: listening to a monaural stimulus, selectively attending to a particular ear during dichotic stimulus presentation, and attending to visual stimuli while ignoring dichotic auditory inputs. We observed no systematic changes in the EFR across experimental manipulations, even though cortical EEG revealed attention-related modulations of alpha activity during the task. We conclude that attentional effects, if any, on human subcortical representation of sounds cannot be observed robustly using EFRs.
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