is underarousal, resulting, e.g., in high novelty and sensation seeking (including that from substance use), risky and antisocial behavior, etc. This becomes emphasized particularly at transition to the reproductive period (which defines fitness) and relative independence, i.e., at adolescence. Cognition and related behavior control mechanisms have evolved and mature much later than the “basic instincts,” which include the need to consume large amounts of food fast when available, and store fat, potentially resulting in obesity.
