行走使人类听觉加工延迟并伴随非周期神经活动的全局变化
Walking delays auditory processing in humans alongside a global shift in aperiodic neural activity
一项bioRxiv预印本研究用移动EEG测试行走是否改变听觉加工时间，30名成人在自由行走或站立时听取侧向纯音，行走使听觉N1潜伏期延迟不足10 ms。对照分析排除了足部触地噪声的污染，多变量解码显示行走时声音位置信息出现更晚，行走还引起全头皮范围的非周期指数下降，且该下降越大、N1延迟越大。
移动EEG实验显示行走会轻微延迟听觉N1并伴随全头皮非周期指数下降，为运动状态影响听觉加工时间提供了可验证证据。
Natural sensory processing unfolds during movement, yet human electrophysiology is usually measured under enforced stillness. Here, we used mobile EEG to test whether walking changes the timing of auditory processing. Thirty adults listened to lateralised pure tones while walking freely or standing. Walking led to a delay in auditory N1 latency (< 10 ms). Control analyses ruled out the possibility that the N1 delay was contaminated by foot strike related noise in EEG. Multivariate decoding further indicated a later emergence of sound location information during walking in the subset of participants with reliable decoding in both states. Walking also produced a scalp wide decrease in the aperiodic exponent of neural responses. A larger global exponent decrease was associated with a larger N1 delay across participants. Together, these findings show that natural walking reorganises the temporal dynamics of human auditory processing and link early sensory slowing to a global change in ongoing cortical state.
来源：bioRxiv · 脑电与神经科学预印本 · biorxiv.org