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Reinforcement sensitivity theory
Reinforcement Sensitivity Theory (RST) proposes three brain-behavioral systems that underlie individual differences in sensitivity to reward, punishment, and motivation. While not originally defined as a theory of personality, the RST has been used to study and predict anxiety, impulsivity, and extraversion.〔 The theory evolved from Gray's biopsychological theory of personality to incorporate findings from a number of areas in psychology and neuroscience, culminating in a major revision in 2000.〔Gray, J.A. and McNaughton, N., (The Neuropsychology of Anxiety: An Enquiry into the Functions of the Septo-Hippocampal System ), July 2003, (Oxford: Oxford University Press), ISBN 978-0-19-852271-3 and ISBN 0-19-852271-1〕 The revised theory distinguishes between fear and anxiety and proposes functionally related subsystems. Measures of RST have not been widely adapted to reflect the revised theory due to disagreement over related versus independent subsystems.〔 Despite this controversy, RST informed the study of anxiety disorders in clinical settings and continues to be used today to study and predict work performance.〔〔 RST, a continuously evolving paradigm, is the subject of multiple areas of contemporary psychological enquiry.〔Corr, P.J., (''The Reinforcement Sensitivity Theory of Personality'' ), April 2008, (Cambridge: Cambridge University), ISBN 978-0-521-61736-9〕
==Origins and evolution of the theory==
Gray's biopsychological theory of personality was informed by his earlier studies with Mowrer on reward, punishment, and motivation and Hans Eysenck’s study of the biology of personality traits. Eysenck linked Extraversion to activation of the Ascending Reticular Activation System (ARAS), an area of the brain which regulates sleep and arousal transitions.
Eysenck's two original personality factors, Neuroticism and Extraversion, were derived from the same lexical paradigm used by other researchers (e.g., Gordon Allport, Raymond Cattell) to delineate the structure of personality. Eysenck’s Extraversion-Arousal Hypothesis states that under low stimulation conditions, introverts (defined as low in Extraversion) will be more highly aroused than extraverts; however, under high stimulation, introverts may become over-aroused, which will feedback within the ARAS and result in ''decreases'' in arousal. Alternatively, extraverts tend to show greater increases in arousal under high stimulation. Eysenck also studied the relationship between neuroticism and activation of the limbic system using classical emotional conditioning models. His theory focused more on anxiety as a disorder than a personality trait.〔 Eysenck’s theory predicts that introverts are more likely to develop anxiety disorders because they show higher neuroticism and stronger emotional conditioning responses under high arousal. His theory was criticized because introverts often show the opposite pattern, weaker classical conditioning under high arousal, and some supporting data confounded personality traits with time of day.
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