Graduate School of Health and Welfare Niigata University of Health and Welfare Graduate School Niigata Japan;
RESCO Corporation Tokyo Japan;
WELCIA YAKKYOKU CO. LTD. Niigata Japan;
Department of Health and Nutrition Niigata University of Health and Welfare Niigata Japan;
Osaka University of Commerce Osaka Japan;
Department of Health and Nutrition Niigata University of Health and Welfare Niigata Japan;
Mastication; Frequency; Brain Activity; Uchida-Kraepelin Test; Near-Infrared Spectroscopy;