原始语音及其回声在人类大脑中被分离并分别处理
Jiaxin Gao1, Honghua Chen1, Mingxuan Fang1
1Key Laboratory for Biomedical Engineering of Ministry of Education, College of Biomedical Engineering and Instrument Sciences, Zhejiang University, Hangzhou, China.
PLoS biology
|February 15, 2024
概括
大脑可以通过将原始语音与其回声分开来处理语音,即使有回声. 这种被称为流分离的听觉系统机制,产生了对回声不敏感的语音表示,以实现清晰的识别.
科学领域:
- 听觉神经科学 听觉神经科学
- 语音处理 语音处理
- 精神声学是一种精神声学.
背景情况:
- 语音识别取决于缓慢的时间调制 (<16 Hz).
- 语音中长时间延迟的回声会减少时间调制,但不会降低可理解性.
- 语言中回声弹性背后的神经机制尚不清楚.
研究的目的:
- 调查语音识别的神经机制,尽管回声诱导的时间调制损失.
- 确定大脑是否跟踪消除的调制或将语音与回声分开.
- 检查注意力和语言细结构在回声弹性中的作用.
主要方法:
- 在人类参与者身上进行磁脑电图 (MEG) 实验.
- 分析皮质活动跟踪时间调节在语音和没有回声.
- 使用语音分离与全回声编码对神经反应的建模.
主要成果:
- 皮质活动跟踪时间调制被回声消除,超过基本适应.
- 神经反应更喜欢语音分离模型,而不是全回声模型.
- 语音隔离效应在注意力转移的情况下持续存在,但在没有细结构线索的情况下消失.
结论:
- 听觉系统采用像流分离这样的机制来创建回声不敏感的语音表示.
- 这种对回声不敏感的表示支持在回声环境中强大的语音识别.
- 语音精细结构对于听觉流分离和回声取消至关重要.
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