双耳节拍:未能增强脑电图功率和情绪唤起。

Binaural Beat: A Failure to Enhance EEG Power and Emotional Arousal.

作者信息

López-Caballero Fran, Escera Carles

机构信息

Brainlab-Cognitive Neuroscience Research Group, Department of Clinical Psychology and Psychobiology, University of Barcelona, Barcelona, Spain.

Institute of Neurosciences, University of Barcelona, Barcelona, Spain.

出版信息

Front Hum Neurosci. 2017 Nov 15;11:557. doi: 10.3389/fnhum.2017.00557. eCollection 2017.

Abstract

When two pure tones of slightly different frequencies are delivered simultaneously to the two ears, is generated a beat whose frequency corresponds to the frequency difference between them. That beat is known as acoustic beat. If these two tones are presented one to each ear, they still produce the sensation of the same beat, although no physical combination of the tones occurs outside the auditory system. This phenomenon is called binaural beat. In the present study, we explored the potential contribution of binaural beats to the enhancement of specific electroencephalographic (EEG) bands, as previous studies suggest the potential usefulness of binaural beats as a brainwave entrainment tool. Additionally, we analyzed the effects of binaural-beat stimulation on two psychophysiological measures related to emotional arousal: heart rate and skin conductance. Beats of five different frequencies (4.53 Hz -theta-, 8.97 Hz -alpha-, 17.93 Hz -beta-, 34.49 Hz -gamma- or 57.3 Hz -upper-gamma) were presented binaurally and acoustically for epochs of 3 min (Beat epochs), preceded and followed by pink noise epochs of 90 s (Baseline and Post epochs, respectively). In each of these epochs, we analyzed the EEG spectral power, as well as calculated the heart rate and skin conductance response (SCR). For all the beat frequencies used for stimulation, no significant changes between Baseline and Beat epochs were observed within the corresponding EEG bands, neither with binaural or with acoustic beats. Additional analysis of spectral EEG topographies yielded negative results for the effect of binaural beats in the scalp distribution of EEG spectral power. In the psychophysiological measures, no changes in heart rate and skin conductance were observed for any of the beat frequencies presented. Our results do not support binaural-beat stimulation as a potential tool for the enhancement of EEG oscillatory activity, nor to induce changes in emotional arousal.

摘要

当两个频率略有不同的纯音同时传递到两只耳朵时,会产生一种拍音,其频率与它们之间的频率差相对应。这种拍音被称为听觉拍音。如果将这两个音调分别呈现给每只耳朵,它们仍然会产生相同拍音的感觉,尽管在听觉系统之外不会发生音调的物理组合。这种现象被称为双耳拍音。在本研究中,我们探讨了双耳拍音对增强特定脑电图(EEG)频段的潜在贡献,因为先前的研究表明双耳拍音作为一种脑电波同步工具具有潜在的用途。此外,我们分析了双耳拍音刺激对与情绪唤醒相关的两种心理生理指标的影响:心率和皮肤电导率。以双耳和听觉方式呈现五个不同频率(4.53赫兹 - θ波、8.97赫兹 - α波、17.93赫兹 - β波、34.49赫兹 - γ波或57.3赫兹 - 上γ波)的拍音,持续3分钟(拍音时段),前后分别有90秒的粉红噪声时段(分别为基线时段和后时段)。在这些时段中的每一个时段,我们分析了脑电图频谱功率,并计算了心率和皮肤电导率反应(SCR)。对于用于刺激的所有拍音频率,在相应的脑电图频段内,基线时段和拍音时段之间未观察到显著变化,无论是双耳拍音还是听觉拍音。对脑电图频谱地形图的进一步分析得出,双耳拍音对脑电图频谱功率头皮分布的影响为阴性结果。在心理生理指标方面,对于呈现的任何拍音频率,均未观察到心率和皮肤电导率的变化。我们的结果不支持双耳拍音刺激作为增强脑电图振荡活动或诱导情绪唤醒变化的潜在工具。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/9b00/5694826/2f4f3a5a79fd/fnhum-11-00557-g0001.jpg

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