Early modulation of visual cortex by sound: an MEG study
Early modulation of visual cortex by sound: an MEG study
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DOI：
10.1016/j.neulet.2004.12.035
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发表时间：
2005-04-18
影响因子：
2.5
通讯作者：
Bhattacharya, J
中科院分区：
文献类型：
--
作者：
Shams, L;Iwaki, S;Bhattacharya, J
声音可以改变视觉感知。最近，一种强烈的错觉证明了这一点，即当伴随多个短暂的声音时，一次闪光被感知为多次闪光。虽然对这种声音引起的闪光错觉的心理物理学发现表明，声音对视觉感知的调节发生在知觉处理水平上，但仍不清楚这些相互作用发生在知觉处理的哪个水平以及介导它们的机制。在这里，我们使用 MEG 研究了这些问题。当将错觉试验与仅视觉和仅听觉试验进行比较时，我们发现枕叶和顶叶头皮位置的活动调节。这种调节早在视觉刺激开始后 35-65 毫秒就发生了。在稍后（类似于刺激后 150 毫秒）开始时，枕叶和顶叶区域以及前部区域的活动也受到调节。在没有感知到幻觉的试验中，枕叶和顶叶区域没有观察到显着的相互作用。这些结果表明，幻觉所反映的视觉感知的听觉改变与视觉皮层活动的调节有关。这些调制的早期发生表明前馈或横向电路至少部分参与了这些相互作用。 (c) 2004 Elsevier Ireland Ltd. 保留所有权利。
Sound can alter visual perception. This has been recently demonstrated by a strong illusion in which a single flash is perceived as multiple flashes when accompanied by multiple brief sounds. While psychophysical findings on this sound-induced flash illusion indicate that the modulations of visual percept by sound occur at a perceptual processing level, it remains unclear at what level of perceptual processing these interactions occur and what mechanisms mediate them. Here we investigated these questions using MEG. We found modulation of activity in occipital and parietal scalp locations, when comparing illusion trials with visual-alone and auditory-alone trials. This modulation occurred as early as 35-65 ms from the onset of the visual stimulus. Activity was also modulated in the occipital and parietal areas as well as anterior areas at a later (similar to 150 ms post-stimulus) onset. No significant interactions were observed in occipital and parietal areas in trials in which illusion was not perceived. These results indicate that the auditory alteration of visual perception as reflected by the illusion is associated with modulation of activity in visual cortex. The early onset of these modulations suggests that a feed-forward or lateral circuitry is at least partially involved in these interactions. (c) 2004 Elsevier Ireland Ltd. All rights reserved.