2024 Volume 4 Issue 1 Article ID: SC-2024-2
Some reports show that sensory stimulation, such as flickering lights and pulse sounds with a 40 Hz cycle, can be useful for treating dementia or suppressing its deterioration. We have previously shown that brain waves are synchronized by listening to amplitude-modulated sounds in addition to pulse sounds. However, the studies were conducted only in young people group. In this study, we employed both elderly and young people to listen to 40-Hz amplitude-modulated sound stimuli to compare the degree of synchronization of gamma waves. Stimuli whose entire sound source of a news or music program was modulated and stimuli only whose part excluding the speech sound was modulated were included. The presentation level was controlled to compensate the loss in hearing level of each participant. The results showed that 40 Hz brain waves were statistically significantly synchronized to all modulated sounds in both age groups showing no clear difference in the degree of brain wave synchronization between the two age groups. This result shows that the gamma-band brain wave is synchronized by presenting
