Intake of 200 mg/day of γ—Aminobutyric Acid(GABA)Improves a Wide Range of Cognitive Functions ―A Randomized, Double—blind, Placebo—controlled Parallel—group Clinical Trial― Atsushi Yamatsu and et al., 薬理と治療, 48, 461-474 (2020), DOI:http://dx.doi.org/