Ricerc@Sapienza

Abstract: In this study, we attempt to validate previous findings on extraversion-related differences in speed of sensorimotor processing and to extend them into Behavioural Approach System (BAS) subtraits within the framework of the revised Reinforcement Sensitivity Theory (rRST) of personality. Here, we will assess psychological traits of extraversion (E), four BAS facets (Goal-Drive Persistence, BAS-GDP; Reward Interest, BAS- RI; Reward Reactivity, BAS-RR; Impulsivity, BAS-I), 60 volunteeers. Stimulus-locked lateralized readiness potential (S-LRP), response-locked LRP (R-LRP), stimulus-locked and response-locked forearm electromyogram (S-EMG and R-EMG), and P3 components of the event- related potentials (ERPs), will berecorded during the performance of a two- choice Go/NoGo visual letter-digit discrimination task varying in task difficulty. We expect that high extraverts, relative to introverts and individuals high relative to low on BAS-RI, will be more likely to exhibit shorter S-LRP latencies and stimulus- and response-locked EMG latencies. Extraverts, relative to introverts, along with those high relative to low on BAS-RR and BAS-I, will exhibite smaller P3 amplitudes.
The present study could improve actual knowledge concerning the relations between sensorimotor processing and individual differences in personality. It would be the first to address the relations between sensory information processing and a multidimensional view of the Behavioral Activation System. In particular, this study would be one of the first to examine the association among central and peripheral motor response initiation, motor response execution and individual differences especially in the `wanting¿ facets of BAS (i.e., BAS-Reward-Interest and/or BAS-Goal-Drive-Persistence).
In addition, it would contribute to corroborate (or not) the view that peripheral and cortical premotor processes are relevant determinants of individual differences in extraversion and BAS-RI.