who developed his approach to personality based on the reticular activation system
Gray's biopsychological theory of personality The biopsychological theory of personality is similar to another one of Gray's theories, reinforcement sensitivity theory. The Biopsychological Theory of Personality was created after Gray disagreed with Hans Eysenck's arousal theory that dealt with biological personality traits.[5] Eysenck looked at the ascending reticular activating system (ARAS) for answering questions about personality. The ARAS is part of the brain structure and has been proposed to deal with cortical arousal, hence the term arousal theory. Eysenck compared levels of arousal to a scale of introversion versus extraversion. The comparison of these two scales was then used to describe individual personalities and their corresponding behavioral patterns.[6] Gray disagreed with Eysenck's theory because Gray believed that things such as personality traits could not be explained by just classical conditioning.[7] Instead, Gray developed his theory which is based more heavily on physiological responses than Eysenck's theory.