早期失明个体和音乐家的增强音调感知是由于减少内部噪声
bioRxiv : the preprint server for biology
|December 15, 2025
概括
早期失明的个体表现出增强的音调歧视,这不是由于更好的频率调,而是减少了内部噪声. 这表明内部噪音是盲目和音乐训练引起的听觉可塑性的关键.
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.
- 感官可塑性 感官可塑性
背景情况:
- 早期失明个体中增强音调感知的常见假设并未得到现有文献的一致支持.
- 听觉频率调整涉及外围/亚皮层和中心/皮层机制,在音调处理中发挥着不同的作用.
研究的目的:
- 通过针对不同阶段的听觉处理任务,研究早期盲人和有视力的个体之间的音调感知差异.
- 确定导致任何观察到的音调感知差异的潜在机制,特别是探索频率调和内部噪声.
主要方法:
- 早期失明和有视力的个体在两个听觉任务上相匹配的音乐训练的性能比较:噪音中的音调检测 (外周/下皮层) 和音调歧视 (皮层).
- 利用计算建模来解释性能差异,并确定内部噪声与频率调节的贡献.
主要成果:
- 两组在音调检测任务上表现相等,表明类似的外周和皮层下频率选择性.
- 早期失明的个体在音调区分任务上表现更好,这表明皮层处理能力更好.
- 计算建模表明,减少内部噪声,而不是更窄的频率调,解释了早期盲人组中增强的音调歧视. 失明和音乐训练都与减少的内部噪音相关.
结论:
- 早期失明会导致增强的音调歧视,由皮质机制调解,主要是通过减少内部神经噪声.
- 减少内部噪声是经验驱动的听觉可塑性的重要因素,受到早期失明和音乐训练的影响.
- 这些发现挑战了以前的假设,并突出了内部噪声在塑造感官经验后的听觉感知中的作用.
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