A neural basis for interindividual differences in the McGurk effect, a multisensory speech illusion.
A neural basis for interindividual differences in the McGurk effect, a multisensory speech illusion.
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DOI：
10.1016/j.neuroimage.2011.07.024
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发表时间：
2012-01-02
期刊：
影响因子：
5.7
通讯作者：
Beauchamp, Michael S.
中科院分区：
文献类型：
--
作者：
Nath, Audrey R.;Beauchamp, Michael S.
麦格克效应是一种令人信服的错觉，在这种错觉中，人类将不匹配的视听语音视为完全不同的音节。然而，一些正常人没有这种错觉，他们报告说，不管有没有视觉输入，刺激听起来都是一样的。越来越多的证据表明，左侧颞上沟（STS）对语音感知过程中的视听整合至关重要。我们使用血氧水平依赖的功能磁共振成像（BOLD fMRI）来测量McGurk感知者和非感知者的大脑活动，包括完整的视听音节、McGurk视听音节和非McGurk不一致的音节。额下回受刺激条件的影响（对不一致刺激的反应更大），而不受易感组的影响；左听皮层受易感组的影响（易感个体的反应更大），而不受刺激条件的影响。只有左侧STS对易感性和刺激条件均有显著影响。左STS反应的振幅与感知McGurk效应的可能性显著相关：弱的STS反应意味着受试者不太可能感知到McGurk效应，而强的反应意味着受试者更有可能感知到它。这些结果表明左STS是言语感知个体间差异的关键位点。
The McGurk effect is a compelling illusion in which humans perceive mismatched audiovisual speech as a completely different syllable. However, some normal individuals do not experience the illusion, reporting that the stimulus sounds the same with or without visual input. Converging evidence suggests that the left superior temporal sulcus (STS) is critical for audiovisual integration during speech perception. We used blood-oxygen level dependent functional magnetic resonance imaging (BOLD fMRI) to measure brain activity as McGurk perceivers and non-perceivers were presented with congruent audiovisual syllables, McGurk audiovisual syllables, and non-McGurk incongruent syllables. The inferior frontal gyrus showed an effect of stimulus condition (greater responses for incongruent stimuli) but not susceptibility group, while the left auditory cortex showed an effect of susceptibility group (greater response in susceptible individuals) but not stimulus condition. Only one brain region, the left STS, showed a significant effect of both susceptibility and stimulus condition. The amplitude of the response in the left STS was significantly correlated with the likelihood of perceiving the McGurk effect: a weak STS response meant that a subject was less likely to perceive the McGurk effect, while a strong response meant that a subject was more likely to perceive it. These results suggest that the left STS is a key locus for interindividual differences in speech perception.
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