Syarifah N. Deraman , Valliyappan D. Natarajan , Mohd Jailani Mohd Nor , Mohd Zaki Nuawi
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Embedded binaural beats, measurement andinstrumentation, auditory evoked potential, biomedicalsignal processing, brainwave synchronization, mentalstates.
Electrical impulses and chemical activities in human brain
generate brain waves at frequency domains ranging
between 0.5 Hz and 100 Hz that characterize different
mental states. The states of attention and focus can be
traced to areas within the prefrontal cortex (PFC) of the
brain at gamma brainwave frequencies of about 40 Hz and
above. The cerebral brain cells can be synchronized to a
desired frequency by externally stimulating the cells using
acoustical means such as binaural beats (BB). Exposure to
pure beats can be annoying and stressful to the listener.
BB signals embedded in a background audio could
provide better listening comfort to the subject. This paper
presents a study on the efficacy of embedded BB in
gamma-domain brainwave synchronization.
Electroencephalograph signals indicative of the auditory
evoked potential (AEP) on test subjects due to resonance
of the PFC with the induced aural stimuli are measured. It
is observed that the BB signals masked in an audio
background give AEP values that are on average 92%
similar to that generated by pure BB. The results indicate
that the embedded BB has an effect comparable to pure
BB on the AEP measured at selected PFC locations at the
40 Hz gamma frequency.