Binaural beats increase interhemispheric alpha-band coherence between auditory cortices

Area of Science:

• Neuroscience
• Auditory Perception
• Brainwave Activity

Background:

• Binaural beats (BBs) are auditory illusions created by presenting slightly different frequencies to each ear.
• BBs are hypothesized to influence cognitive and physiological functions via brain hemisphere synchronization.

Purpose of the Study:

• To investigate the effect of BBs on interhemispheric coherence using electroencephalograms (EEG).
• To determine if BBs enhance neural synchrony between auditory cortices.
• To assess behavioral aftereffects of BBs on binaural listening tasks.

Main Methods:

• EEG recordings were taken during resting state, BBs stimulation, and a monaural control condition.
• Interhemispheric coherence was calculated to measure neural synchrony between hemispheres.
• A dichotic digit task was administered post-BBs stimulation to evaluate behavioral effects.

Main Results:

• BBs significantly increased interhemispheric coherence between auditory cortices compared to resting state and monaural beats.
• Both alpha (10 Hz) and theta (4 Hz) beat frequencies enhanced coherence, primarily in the alpha band.
• No significant behavioral effects were observed in the dichotic digit task immediately following BBs exposure.

Conclusions:

• BBs enhance alpha-band oscillation synchrony between auditory cortices during auditory stimulation.
• The observed synchrony enhancement likely reflects binaural integration processes.
• BBs do not appear to cause neural entrainment based on the tested behavioral paradigm.