Jirakittayakorn Nantawachara, Wongsawat Yodchanan
Annu Int Conf IEEE Eng Med Biol Soc. 2015;2015:4687-91. doi: 10.1109/EMBC.2015.7319440.
Beat phenomenon is occurred when two slightly different frequency waves interfere each other. The beat can also occur in the brain by providing two slightly different frequency waves separately each ear. This is called binaural beat. The brain responses to binaural beat are in discussion process whether the brain side and the brain area. Therefore, this study aims to figure out the brain responses to binaural beat by providing different binaural beat frequencies on 250 carrier tone continuously for 30 minutes to participants and using quantitative electroencephalography (QEEG) to interpret the data. The result shows that different responses appear in different beat frequency. Left hemisphere dominance occur in 3 Hz beat within 15 minutes and 15 Hz beat within 5 minutes. Right hemisphere dominance occurs in 10 Hz beat within 25 minute. 6 Hz beat enhances all area of the brain within 10 minutes. 8 Hz and 25 Hz beats have no clearly responses while 40 Hz beat enhances the responses in frontal lobe. These brain responses can be used for brain modulation application to induce the brain activity in further studies.
当两个频率略有不同的波相互干涉时，就会出现拍频现象。通过分别向每只耳朵提供两个频率略有不同的波，大脑中也会出现拍频。这被称为双耳节拍。关于大脑对双耳节拍的反应，无论是在大脑半球还是脑区方面，都还在讨论之中。因此，本研究旨在通过向参与者连续30分钟提供250赫兹载波音上的不同双耳节拍频率，并使用定量脑电图（QEEG）来解释数据，从而弄清楚大脑对双耳节拍的反应。结果表明，不同的节拍频率会出现不同的反应。在15分钟内，3赫兹节拍出现左半球优势；在5分钟内，15赫兹节拍出现左半球优势。在25分钟内，10赫兹节拍出现右半球优势。6赫兹节拍在10分钟内增强大脑的所有区域。8赫兹和25赫兹节拍没有明显反应，而40赫兹节拍增强额叶的反应。这些大脑反应可用于大脑调制应用，以便在进一步研究中诱导大脑活动。
