在清醒的非人类灵长类动物的皮层下听力系统中对振幅调制的编码中的等级差异
Chase A Mackey1,2, Samantha Hauser2, Adriana M Schoenhaut1
1Neuroscience Graduate Program, Vanderbilt University, Nashville, Tennessee, United States.
Journal of neurophysiology
|August 14, 2024
概括
在清醒的子中,听觉处理揭示了大脑干的耳核 (CN) 和中脑下层结膜 (IC) 编码声音膜调制. 聚合CN活动足以解释幅度调制歧视,这表明早期皮层下处理是关键.
科学领域:
- 神经科学是一个神经科学.
- 听觉感知是一种听觉感知.
- 计算神经科学是一种神经科学.
背景情况:
- 鼻状振幅调制 (SAM) 对于复杂的声音感知至关重要.
- 以前对麻醉动物的研究表明,从内核 (CN) 转移到内核 (IC) 的代码,从时间转移到速度.
- 有限的研究存在于这些神经代码在清醒的非人类灵长类动物在调制频率感知期间.
研究的目的:
- 为了比较CN和IC的神经编码策略与清醒的行为调制频率 (MF) 歧视.
- 研究 CN 和 IC 中的神经反应如何与区分调制频率中的心理物理性能有关.
- 模拟听觉信息在次皮层层次的时间整合.
主要方法:
- 在清醒的CN和IC中记录了单个单位的反应.
- 通过比较来自神经活动的神经测量值与来自行为性MF歧视的心理测量值.
- 利用漂移扩散模型来分析时间整合和个体性能差异.
主要成果:
- 无论是CN和IC神经元都对SAM表现出调整的反应,使用速率和尖端定时代码.
- IC神经测量值往往低于或等于心理测量值,而CN值通常更高.
- 任何结构中的聚合活动都可以解释较低的MF (10-20 Hz) 的歧视,而更高的MF需要更有选择性的聚合.
结论:
- 皮下神经活动,特别是聚合的CN活动,足以区分声音外调制.
- 大脑干和中脑表现出时间整合能力,虽然在短时间内比行为慢,但有助于听觉感知.
- 这些发现提供了对振幅调制感知,弥合感官编码和决策的神经生理学和计算解释.
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