Li Yueying, Noguchi Yasuki
Department of Psychology, Graduate School of Humanities, Kobe University, 1-1 Rokkodai- cho, Nada, Kobe, 657-8501 Japan.
Cogn Neurodyn. 2025 Dec;19(1):28. doi: 10.1007/s11571-024-10183-0. Epub 2025 Jan 15.
The integration of auditory and visual stimuli is essential for effective language processing and social perception. The present study aimed to elucidate the mechanisms underlying audio-visual (A-V) integration by investigating the temporal dynamics of multisensory regions in the human brain. Specifically, we evaluated inter-trial coherence (ITC), a neural index indicative of phase resetting, through scalp electroencephalography (EEG) while participants performed a temporal-order judgment task that involved auditory (beep, A) and visual (flash, V) stimuli. The results indicated that ITC phase resetting was greater for bimodal (A + V) stimuli compared to unimodal (A or V) stimuli in the posterior temporal region, which resembled the responses of A-V multisensory neurons reported in animal studies. Furthermore, the ITC got lager as the stimulus-onset asynchrony (SOA) between beep and flash approached 0 ms. This enhancement in ITC was most clearly seen in the beta band (13-30 Hz). Overall, these findings highlight the importance of beta rhythm activity in the posterior temporal cortex for the detection of synchronous audiovisual stimuli, as assessed through temporal order judgment tasks.
The online version contains supplementary material available at 10.1007/s11571-024-10183-0.
听觉和视觉刺激的整合对于有效的语言处理和社会感知至关重要。本研究旨在通过研究人类大脑中多感官区域的时间动态来阐明视听（A-V）整合的潜在机制。具体而言，当参与者执行涉及听觉（哔哔声，A）和视觉（闪光，V）刺激的时间顺序判断任务时，我们通过头皮脑电图（EEG）评估了试验间相干性（ITC），这是一种指示相位重置的神经指标。结果表明，与单峰（A或V）刺激相比，后颞叶区域中双峰（A + V）刺激的ITC相位重置更大，这类似于动物研究中报道的A-V多感官神经元的反应。此外，随着哔哔声和闪光之间的刺激起始异步（SOA）接近0毫秒，ITC变大。这种ITC的增强在β波段（13-30Hz）中最为明显。总体而言，这些发现突出了后颞叶皮质中β节律活动对于通过时间顺序判断任务评估的同步视听刺激检测的重要性。
在线版本包含可在10.1007/s11571-024-10183-0获取的补充材料。
