“…In Eysenck's arousal theory of personality (Eysenck, 1967), extraverts are proposed to be characterised by lower levels of cortical activity compared to introverts (Fink, Grabner, Neuper, & Neubauer, 2005;Kumari, ffytche, Williams, & Gray, 2004). Extraverts also show reduced autonomic arousal, including lower heart rate and attenuated sympathetic skin responses during perceptual and cognitive tasks, when compared to introverts, (Geen, 1984;Harvey & Hirschmann, 1980). Within the same framework, neuroticism is linked to heightened autonomic reactivity to emotional stimuli (Harvey & Hirschmann, 1980;Norris, Larsen, & Cacioppo, 2007), an effect arguably mediated through heightened reactivity of 'visceral brain' centres [amygdala, anterior cingulate cortex (ACC), insula, and vmPFC (Ormel et al, 2013)].…”