在音节生产过程中,皮层声学表示的侧面化和时间流程
Andrew Meier1, Scott Kuzdeba2, Liam Jackson3
1Department of Speech, Language, and Hearing Sciences, Boston University, Boston, MA 02215 amsmeier@bu.edu.
eNeuro
|September 22, 2023
概括
大脑根据语音的持续时间来代表不同的语音. 像辅音这样的更短的声音在左半球中被处理,而像音节这样的更长的声音在发言过程中参与了右半球.
科学领域:
- 神经科学是一个神经科学.
- 语言学的语言学.
- 语音制作 语音制作
背景情况:
- 口语整合信息跨越千秒 (音声学) 到分钟 (语义学).
- 在不同的时间尺度上结合语音特征的神经机制仍然不清楚.
- 了解语音的产生需要检查语音单元的表示.
研究的目的:
- 调查辅音,元音和音节的空间和时间皮层表示.
- 确定大脑如何编码不同持续时间的声学单元.
- 探索语音单元持续时间和语音编码中的半球横向化之间的关系.
主要方法:
- 使用了五名参与者讲单音节的电皮质谱 (ECoG) 记录.
- 开发了用于时间响应配置文件的新型聚类和卡尔曼波器分析.
- 采用线性分辨分类来评估通过电极编码的声学特征.
主要成果:
- 观察到不同的时间编码模式:辅音 (准备),元音 (甚至整个),音节 (制作).
- 语音编码的电极位置因语音单元的持续时间而异:辅音 (左侧化),母音 (平衡),音节 (右侧化).
- 特定的皮层区域显示出偏好的编码:左前中/后中旋转 (辅音),右中前线旋转 (音节).
结论:
- 这些发现支持神经语言学理论关于半球专业化处理语音的理论.
- 左半球专注于短时间语言单位 (辅音).
- 右半球在发言过程中专注于较长时间的单元 (音节).
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