An analysis of audio-visual crossmodal integration by means of event-related potential (ERP) recordings
An analysis of audio-visual crossmodal integration by means of event-related potential (ERP) recordings
复制标题
DOI：
10.1016/s0926-6410(02)00065-4
复制
发表时间：
2002-06-01
期刊：
影响因子：
--
通讯作者：
Hillyard, SA
中科院分区：
文献类型：
--
作者：
Teder-Sälejärvi, WA;McDonald, JJ;Hillyard, SA
通过以600和800 ms之间的不规则间隔从中央位置呈现随机序列的听觉（短暂的噪声爆发）、视觉（闪光）和视听（同时的噪声爆发和闪光）刺激，对人类的跨模态整合进行了研究。15)目标刺激可以是更强烈的噪声突发、更明亮的闪光或两者的组合。根据以往的研究，行为数据表明，双峰目标刺激的反应更快，更准确地识别比单峰目标刺激。通过从组合视听（AV）刺激的ERP中减去单独听觉（A）和视觉（V）刺激的ERP来研究这种跨模态相互作用的神经基础（即相互作用= AV-（A + V））。使用这种方法，我们复制了早期（约40毫秒）和晚期（100毫秒后）ERP相互作用的影响以前的报告。然而，它似乎是非常早期的相互作用的影响，可以在很大程度上占了预期的ERP之前的单峰和双峰刺激。在计算ERP相互作用时，这个缓慢的偏移被减去两次，导致相反极性的明显偏移，这可能与实际的跨模态相互作用混淆。(C)2002 Elsevier Science B.V.保留所有权利。
Crossmodal integration was studied in humans by presenting random sequences of auditory (brief noise bursts), visual (flashes), and audiovisual (simultaneous noise bursts and flashes) stimuli from a central location at irregular intervals between 600 and 800 ms. The subjects' task was to press a button to infrequent and unpredictable (P = 0. 15) target stimuli that could be either a more intense noise burst, a brighter flash, or a combination of the two. In accordance with previous studies, behavioral data showed that bimodal target stimuli were responded to much faster and were identified more accurately than the unimodal target stimuli. The neural basis of this crossmodal interaction was investigated by subtracting the ERPs to the auditory (A) and the visual (V) stimuli alone from the ERP to the combined audiovisual (AV) stimuli (i.e. interaction=AV- (A+ V)). Using this approach, we replicated previous reports of both early (at around 40 ms) and late (after 100 ms) ERP interaction effects. However, it appears that the very early interaction effects can be largely accounted for by an anticipatory ERP that precedes both the unimodal and bimodal stimuli. In calculating the ERP interaction this slow shift is subtracted twice, resulting in an apparent shift of the opposite polarity that may be confounded with actual crossmodal interactions. (C) 2002 Elsevier Science B.V. All rights reserved.