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We studied the effect of high frequency hypersonic inaudible sound on brain activity in young middle-aged people and cognitively normal elderly people using PET and EEG. The participants were average 36.8 years of age SD ± 7.7 years of age (27 years old to 48 years old), 3 males, 5 females, is healthy volunteers of a total of eight people and mean age 77.6 years old SD ± 4.1 years (72 years to 88 years), 5 males, 10 females, is the healthy elderly of a total of 15 people. The sound stimulation to young middle-aged people and elderly people was shown to activate their brainstems and increase the α wave in the occipital lobe, 〒 434−8601 静岡県浜松市浜北区平口 5000 TEL:053−586−7111 FAX:053−586−6180 (5000Hirakuchi Hamakita ku, Hamamatsu city, Shizuoka, 434−8601, Japan) Corresponding author: okada@crl.hpk.co.jp(岡田裕之) Nippon Laser Igakkaishi

The Brain Activation Due to the High Frequency Non-Audible Sound, Study by PET and EEG for Young Middle-Aged People and Healthy Elderly