The monaural beat is known that it can modulate brain and personal states. However, which changes in brain waves are related to changes in state is still unclear. Therefore, we aimed to investigate the effects of monaural beats and find the relationship between them. Ten participants took part in five separate random sessions, which included a baseline session and four sessions with monaural beats stimulation: one audible session and three inaudible sessions. Electroencephalogram (EEG) were recorded and participants completed pre- and post-stimulation questionnaires assessing mood and sleepiness. As a result, audible session led to increased arousal and positive mood compared to other conditions. From the neurophysiological analysis, statistical differences in frontal-central, central-central, and central-parietal connectivity were observed only in the audible session. Furthermore, a significant correlation was identified between sleepiness and EEG power in the temporal and occipital regions. These results suggested a more detailed correlation for stimulation to change its personal state. These findings have implications for applications in areas such as cognitive enhancement, mood regulation, and sleep management.

翻译：单耳节拍被认为能够调节大脑状态和个人状态。然而，脑波变化与状态改变之间的具体关联尚不清楚。因此，本研究旨在探究单耳节拍的影响并揭示两者之间的关系。十名参与者参加了五次独立随机实验，包括一次基线实验和四次施加单耳节拍刺激的实验：一次可听刺激实验和三次不可听刺激实验。实验期间记录脑电图（EEG），参与者在刺激前后填写评估情绪和困倦程度的问卷。结果表明，与其他条件相比，可听刺激实验提高了觉醒水平并改善了积极情绪。神经生理学分析显示，仅在可听刺激实验中观察到额中央区、中央区-中央区及中央-顶叶连接的统计差异。此外，困倦程度与颞叶和枕叶区域的脑电功率之间存在显著相关性。这些结果表明，改变个体状态的刺激与脑电活动之间存在更细致的关联。该发现对认知增强、情绪调节和睡眠管理等领域具有应用启示。