PROCESSING OF AUDITORY-STIMULI DURING AUDITORY AND VISUAL-ATTENTION AS REVEALED BY EVENT-RELATED POTENTIALS
PROCESSING OF AUDITORY-STIMULI DURING AUDITORY AND VISUAL-ATTENTION AS REVEALED BY EVENT-RELATED POTENTIALS
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DOI：
10.1111/j.1469-8986.1994.tb01050.x
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发表时间：
1994-09-01
期刊：
影响因子：
3.7
通讯作者：
ALGAZI, A
中科院分区：
文献类型：
--
作者：
ALHO, K;WOODS, DL;ALGAZI, A
在听觉和视觉选择性注意任务期间记录听觉事件相关的脑电位（ERP）。听觉刺激包括随机传送到左耳和右耳的频繁标准音调（1000 Hz）和不常见的异常音调（1050 Hz 和 1300 Hz）。视觉刺激是视频监视器上以平均 6 秒间隔随机呈现的垂直线光栅。在听觉注意期间，受试者注意指定耳朵中的刺激并对所注意的音调中出现的 1300 Hz 偏差做出反应。在视觉注意期间，受试者对偶尔的视觉刺激做出反应。相对于传递至无人照管耳朵的音调引起的 ERP 以及视觉注意期间听觉刺激引起的 ERP，传递至有人照管的耳朵的音调的 ERP 出现负位移。这种注意力效应由具有早期和晚期成分的负差异波组成。失配负值 (MMN) 是由 1300 Hz 和 1050 Hz 偏差引起的，无论它们是否出现在有人参与或无人参与的音调中。 MMN 振幅不受注意力的影响，这支持了 MMN 是由自动大脑辨别过程生成的提议。
Auditory event-related brain potentials (ERPs) were recorded during auditory and visual selective attention tasks. Auditory stimuli consisted of frequent standard tones (1000 Hz) and infrequent deviant tones (1050 Hz and 1300 Hz) delivered randomly to the left and right ears. Visual stimuli were vertical line gratings randomly pre sented on a video monitor at mean intervals of 6 s. During auditory attention, the subject attended to the stimuli in a designated ear and responded to the 1300-Hz deviants occurring among the attended tones. During visual attention, the subject responded to the occasional visual stimuli. ERPs for tones delivered to the attended ear were negatively displaced relative to ERPs elicited by tones delivered to the unattended ear and to ERPs elicited by auditory stimuli during visual attention. This attention effect consisted of negative difference waves with early and late components. Mismatch negativities (MMNs) were elicited by 1300-Hz and 1050-Hz deviants irrespective of whether they occurred among attended or unattended tones. MMN amplitudes were unaffected by attention, supporting the proposal that the MMN is generated by an automatic cerebral discrimination process.