personlety theory by gray
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he biopsychological theory of personality, proposed by research psychologist Jeffrey Alan Gray in 1970, is a well supported model of the general biological processes relevant for human psychology, behavior, and personality. Gray hypothesized the existence of two brain-based systems for controlling a person's interactions with their environment: the behavioural inhibition system (BIS) and the behavioural activation system (BAS).[1][2][3] BIS is related to sensitivity to punishment and avoidance motivation. BAS is associated with sensitivity to reward and approach motivation. Psychological scales have been designed to measure these hypothesized systems and study individual differences in personality.[4] Neuroticism, a widely studied personality dimension related to emotional functioning, is positively correlated with BIS scales and negatively correlated with BAS scales.[