Blunte affect is the scientific term describing a lack of emotional reactivity on the part of an individual. The precise boundary between the generally positive personality trait "serious" and the generally pathological "blunted affect" is impossible to describe precisely because it is culture specific and relies on subjective values. For example, the Japanese are often described as "unemotional" (even to the point of "blunted in affect") by Americans, and so the same individual may be considered to display a blunted affect in one culture and be merely "serious" or "unemotional" in another. See culture-specific syndrome.