神经阿尔法振荡指数是对模两可的元音序列的上下文驱动的感知
Claude Alain1,2, Katharina Göke1, Dawei Shen1
1Rotman Research Institute, Toronto, ON M6A 2E1, Canada.
iScience
|December 7, 2023
概括
之前的听觉背景会影响感知. 听众通常会感知到与前面的声音相反的声音,这是一种与听觉大脑区域神经适应相关的对比效应.
科学领域:
- 听觉神经科学 听觉神经科学
- 感知心理学 感知心理学
- 认知神经科学 认知神经科学
背景情况:
- 众所周知,对模两可的刺激的感知受到先前的背景的影响.
- 这种影响可以表现为同化 (与先前感知相匹配) 或对比 (与先前感知相反).
研究的目的:
- 为了研究底层的神经机制可视元音刺激的听觉对比效应.
- 要确定特定的大脑区域及其活动模式是否与这种感知现象相关.
主要方法:
- 使用高密度脑电图 (EEG) 来记录大脑活动.
- 参与者听取了各种形式过渡的元音序列,包括最后一个模两可的序列.
- 听觉感知行为报告与EEG数据一起收集.
主要成果:
- 参与者表现出明显的倾向,感知与前面的元音感知相反的东西 (听觉对比效应).
- 这种对比效应与特定大脑区域的α功率变化有关,包括左角环和双边感觉运动/上边缘区域.
- 感觉运动/超边缘区域的活动与个别参与者的感知报告相关.
结论:
- 对于可二元化的母音序列的听觉对比效应似乎是由后部听觉区域的神经适应介导的.
- 这些适应性变化影响了模两可的听觉刺激的解释方式,影响了感知构造.
- 这些发现突显了上下文依赖的神经过程在塑造听觉感知中的作用.
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