Anger, sadness, joy, and other mental states related to human mood and consciousness are called feelings or emotions. Feelings and emotions are deeply involved in human value judgments and decision-making in everyday life and are also used in communication with others. While there are various definitions of feelings and emotions depending on the research field, recent studies in physiology, neuroscience, and psychology often define emotion as the body’s reactions or activities themselves and feeling as the state in which these emotions are cognitively perceived by the brain.