Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6950917 | Biomedical Signal Processing and Control | 2018 | 11 Pages |
Abstract
Audiovisual stimuli with specific frequency can cause the brain to oscillate in the same frequency, something which is also called brain entrainment. One method to entrain the brain through the auditory system is binaural beats. Binaural beats are two rhythmic tones with slightly different frequency which are presented separately to each ear. The brain perceives an illusionary signal with the frequency of the difference of the two exerted tones and oscillates in that frequency. There are contradictory findings in the previous studies in which some researchers could not entirely observe this phenomenon. In this paper we propose a protocol to inspect whether binaural beats can change the power and connectivity of the brain and also how lengthening the stimuli, interchangeably with pink noise, will affect the outcomes. Fifteen healthy participants attended this study and their EEG signals were recorded during presentation of 200â¯Hz and 207â¯Hz sinusoidal tones to their left and right ears respectively. Total 9â¯min of binaural beats were divided into three 3-min blocks which were separated by 1â¯min of pink noise to prevent the brain from habituating to the stimuli. Our results showed that 3â¯min of 7â¯Hz binaural beats is not enough to entrain the brain, but applying 6â¯min of stimulation could change the relative power in the temporal and parietal lobes and further exposure to 9â¯min of stimuli could also alter the brain network, evaluated by the graph theory.
Related Topics
Physical Sciences and Engineering
Computer Science
Signal Processing
Authors
Tirdad Seifi Ala, Mohammad Ali Ahmadi-Pajouh, Ali Motie Nasrabadi,