频率范围超过约30Hz,表示为伽马频率范围,与各种认知功能有关,意识,感觉统合,短期记忆,工作记忆,情节记忆的编码和维护,和检索过程。在这项研究中,我们提出了一种新形式的伽马刺激,叫做伽玛音乐,结合40赫兹的听觉刺激和音乐。这种伽玛音乐由鼓组成,低音,和键盘的声音,每个包含40Hz频率振荡。由于已知40Hz刺激会引起听觉稳态反应(ASSR),我们使用40Hz功率和相位锁定指数(PLI)作为声音刺激期间神经活动的指数。我们还使用视觉模拟量表通过问卷记录了每种声音的主观评分。伽玛音乐,伽马鼓,伽马低音,与没有40Hz振荡的对照音乐相比,伽玛键盘声音在40Hz功率和PLI中显示出明显更高的值。特别是,伽马键盘声音显示出诱发强烈ASSR的潜力,在这些指数中显示出较高的值。在主观评分中,伽玛音乐,尤其是伽玛键盘的声音,收到更多的放松,舒适,首选,愉快,与传统伽马刺激的对照音乐相比,自然印象。这些结果表明,我们提出的伽马音乐具有作为诱导ASSR的新方法的潜力。特别是,伽马键盘的声音被证明是一个有效的声源,诱导一个强大的ASSR,同时保持舒适和愉快的感觉听音乐。我们开发的伽玛音乐,其特点是对人耳的愉悦,为长期使用伽玛刺激提供了显著的优势。与传统的40Hz刺激相比,这种音乐的使用可能会减轻参与者的身体和心理负担。这种音乐不仅有望为利用ASSR的基础神经科学研究做出贡献,而且还有助于实施基于伽玛音乐的干预措施,旨在增强人类日常生活中的认知功能。
A frequency range exceeding approximately 30 Hz, denoted as the gamma frequency range, is associated with various cognitive functions, consciousness, sensory integration, short-term memory, working memory, encoding and maintenance of episodic memory, and retrieval processes. In this study, we proposed a new form of gamma stimulation, called gamma music, combining 40 Hz auditory stimuli and music. This gamma music consists of drums, bass, and keyboard sounds, each containing a 40 Hz frequency oscillation. Since 40 Hz stimuli are known to induce an auditory steady-state response (ASSR), we used the 40 Hz power and phase locking index (PLI) as indices of neural activity during sound stimulation. We also recorded subjective ratings of each sound through a questionnaire using a visual analog scale. The gamma music, gamma drums, gamma bass, and gamma keyboard sounds showed significantly higher values in 40 Hz power and PLI compared to the control music without a 40 Hz oscillation. Particularly, the gamma keyboard sound showed a potential to induce strong ASSR, showing high values in these indices. In the subjective ratings, the gamma music, especially the gamma keyboard sound, received more relaxed, comfortable, preferred, pleasant, and natural impressions compared to the control music with conventional gamma stimulation. These results indicate that our proposed gamma music has potential as a new method for inducing ASSR. Particularly, the gamma keyboard sound proved to be an effective acoustic source for inducing a strong ASSR while preserving the comfortable and pleasant sensation of listening to music. Our developed gamma music, characterized by its pleasantness to the human ear, offers a significant advantage for the long-term use of gamma stimulation. The utilization of this music could potentially reduce the physical and psychological burden on participants compared to conventional 40 Hz stimuli. This music is not only expected to contribute to fundamental neuroscience research utilizing ASSR but also to facilitate the implementation of gamma music-based interventions aimed at enhancing human cognitive functions in everyday life.