Brain oscillations, inhibitory control mechanisms and rewarding

摘要

Internet Addiction (IA) is considered a subtype of impulse control disorder, and a behaviorrelated to rewarding system deficits. However whether and how impulse control deficits arerelated to in rewarding mechanisms is actually unexplored. The present research aims toexamine the neural correlates of deficits in inhibitory control and the rewarding mechanisms inIA in a sample of young people. Internet Addiction Inventory (IAT) was applied to a subclinicalsample. Secondly, cortical oscillations (frequency bands) and personality trait(Behavioral Inhibition System, BIS; Behavioral Activation System, BAS) were considered toexplain IA. Oscillatory brain activity (delta, theta, alpha, beta and gamma) and response times(RTs) were monitored during the performance of a Go/NoGo task in response online gamblingvideos, videogames or neutral stimuli. BAS, BAS-R (BAS-Reward subscale), BIS and IATpredicted the low-frequency band variations, although in an opposite direction: reduced deltaand theta and RTs values were found for higher BAS, BAS-R and IAT, in the case of NoGo forgambling and videogames stimuli; in contrast increased delta and theta and RTs values wereobserved for higher BIS. Two potential different young subjects’ clusters were suggested: with lowinhibitory impulse control and rewarding bias (higher BAS and IAT); and with impulse hypercontrol(higher BIS).