Problem to be solved. To provide a new use for α-glycosyl isoquercitrin. Solution. The present invention provides a composition for enhancing c-FOS expression in a hippocampus, a composition for enhancing Grin2d expression in amygdala, a composition for promoting fear memory erasing learning, and a composition for preventing or improving the onset of posttraumatic stress disorder, containing α-glycosyl isoquercitrin as an active ingredient. The composition is preferably an orally ingested or administered pharmaceutical, quasi drug, or food and drink.

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