首页> 外文期刊>Cerebral cortex >Cross-modal integration and plastic changes revealed by lip movement, random-dot motion and sign languages in the hearing and deaf.
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Cross-modal integration and plastic changes revealed by lip movement, random-dot motion and sign languages in the hearing and deaf.

机译:唇部运动,随机点运动和听觉和聋哑人的手语显示出跨模态整合和塑性变化。

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Sign language activates the auditory cortex of deaf subjects, which is evidence of cross-modal plasticity. Lip-reading (visual phonetics), which involves audio-visual integration, activates the auditory cortex of hearing subjects. To test whether audio-visual cross-modal plasticity occurs within areas involved in cross-modal integration, we used functional MRI to study seven prelingual deaf signers, 10 hearing non-signers and nine hearing signers. The visually presented tasks included mouth-movement matching, random-dot motion matching and sign-related motion matching. The mouth-movement tasks included conditions with or without visual phonetics, and the difference between these was used to measure the lip-reading effects. During the mouth-movement matching tasks, the deaf subjects showed more prominent activation of the left planum temporale (PT) than the hearing subjects. During dot-motion matching, the deaf showed greater activation in the right PT. Sign-related motion, with or without a lexical component, activated the left PT in the deaf signers more than in the hearing signers. These areas showed lip-reading effects in hearing subjects. These findings suggest that cross-modal plasticity is induced by auditory deprivation independent of the lexical processes or visual phonetics, and this plasticity is mediated in part by the neural substrates of audio-visual cross-modal integration.
机译:手语可以激活聋人的听觉皮层,这是交叉模态可塑性的证据。涉及视听整合的口头阅读(视觉语音)可以激活听力对象的听觉皮层。为了测试视听跨模态可塑性是否在跨模态整合所涉及的区域内发生,我们使用功能性MRI研究了7名舌前聋人,10名非听觉人和9名聋人。视觉呈现的任务包括嘴巴运动匹配,随机点运动匹配和与符号相关的运动匹配。嘴巴运动的任务包括有或没有视觉语音的情况,并且将两者之间的差异用于测量唇读效果。在进行口部运动匹配任务期间,耳聋的受试者比听力正常的受试者表现出更显着的左颞颞叶(PT)激活。点运动匹配期间,聋人在右侧PT中显示出更大的激活能力。带有或不带有词法成分的与手势相关的运动比在听力签名者中更能激活聋人签名者的左PT。这些区域在听力对象中显示出唇读效果。这些发现表明,跨模态可塑性是由听觉剥夺诱导的,与词汇过程或视觉语音无关,并且这种可塑性部分地由视听跨模态整合的神经基质介导。

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