Jeffrey Gray's neurobiological personality theory positing three systems — BIS (Behavioral Inhibition), BAS (Behavioral Activation), FFFS (Fight-Flight-Freeze) — as the neurobiological bases of anxiety, impulsivity, and fear.
RST revised (2000, Gray & McNaughton): the original BIS/BAS framework updated with the Fight-Flight-Freeze System (FFFS) as a third system responding to punishment and innate fear stimuli. BIS responds specifically to conflict (competing approach and avoidance goals), BAS to reward, FFFS to current punishment/threat. A comprehensive neurobiological theory of personality. The most biologically grounded personality theory.
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