Analysis of EEG Characteristics under Binaural Auditory Beat Stimulation

Binaural auditory beats can induce changes in brain signals through the auditory system in a non-invasive way, but conclusions as to enhancing specific EEG frequency bands and affecting human cognition and emotion are still controversial. In order to explore the effect of binaural auditory beats on brain function, this paper uses a digital synthesizer to design and generate binaural auditory beats stimulation in Delta and Beta frequency bands. Then 18 subjects are selected for the experiment, and the EEG signals of them are collected through TGAM module, from which two EEG features of marginal spectrum and complexity are extracted. At last, the changes of EEG eigenvalues before and after two auditory beat stimuli are analyzed respectively to explore their influence on EEG. The results show that changes of the marginal spectrum energy of each rhythm before and after the auditory beat stimulation have a strong consistency, which is contrary to the conclusion of enhancing the specific EEG frequency band. However, the (Alpha+Theta)/Beta marginal spectral energy ratio decreased after the Beta auditory beat stimulus, while the (Alpha+Beta)/Theta marginal spectral energy ratio increased after the Delta auditory beat and decreased after the Beta auditory beat stimulus, and the ratio demonstrated a certain regularity. The complexity of males decreased after Delta and increased after Beta, but the complexity of females did not change significantly. The above experimental results and conclusions provide a certain basis for further exploring the effect of binaural auditory beats on brain function, and indicate the direction for further study on brain function and brain activity improvement.