隔离意识语言感知的神经特征与无报告的正弦波语音范式
Yunkai Zhu1, Charlotte Li2, Camille Hendry2
1Department of Biomedical Engineering, University of Miami, Coral Gables, Florida 33143.
概括
研究人员使用EEG识别了与有意识的语音感知相关的大脑反应. 一个特定的负脑波 (感知意识消极性) 出现了当言语被意识地感知,而不仅仅是当它与任务相关时.
科学领域:
- 认知神经科学 认知神经科学
- 听觉感知是一种听觉感知.
- 神经成像是一种神经成像.
背景情况:
- 识别意识感知的神经标记在认知神经科学中至关重要.
- 以前的研究经常将感知意识与后感知处理混为一谈,特别是在视觉领域.
- 从任务相关性中分离有意识的感知是分离意识的神经相关的关键.
研究的目的:
- 为了识别意识的语音感知的神经相关性.
- 区分与主观语言体验相关的大脑反应与与任务相关性相关的大脑反应.
- 调查神经活动的时间动态在有意识的听觉感知期间.
主要方法:
- 在人类参与者中利用了三相正弦波语音范式.
- 在实验期间记录了脑电图 (EEG) 数据.
- 比较神经对语音令牌的反应,被认为是语音与噪音,以及与任务相关的与与任务无关的刺激.
主要成果:
- 与噪音相比,对言语的有意识感知引起了左侧的,近顶部的消极 (200-300毫秒后开始).
- 这种语音感知意识的消极性对于控制令牌来说是不存在的,从来没有被认为是语音.
- 任务相关性调节了P3b组件,但不是与语音感知本身相关的早期消极性.
结论:
- 这些发现表明,中期潜伏期的负面脑反应是有意识的听觉 (语音) 感知的神经相关物.
- 这种感知意识的消极性可能是特定于内容的,并且可以从任务相关性中分离出来.
- 意识感知的相关性,无论内容如何,都可能存在于中延迟,内容特定的感觉大脑反应中.
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