Despite the implementation of various countermeasures, environmental noise is still causing a wide range of problems in our modern daily life. The present study focused on the acoustic properties of environmental noise besides its volume and investigated the effect of repetitive auditory stimuli with different tones on living organisms through bioinstrumentation. The repetitive auditory stimuli used comprised a sine wave, white noise, and pink noise. After measuring the brain waves and reaction time of subjects exposed to auditory stimuli, we analyzed the input intensities in the primary sensory area, deep brain activities, and information processing rates. Compared with the other auditory stimuli used, the pink noise had strong input intensities in the primary sensory area and elicited fast reactions to the stimuli while suppressing deep brain activities. While sensory gating is known to occur in response to consecutive auditory stimuli consisting of the same tone, this study has suggested that differences in particular auditory stimuli can decrease sensory gating effects and, by extension, suppress deep brain activities.
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