The role of beta-gamma oscillations in unexpected rewards processing

NeuroImage
Azadeh HajiHosseiniJosep Marco-Pallares

Abstract

Reward processing in humans is carried out by an extensive fronto-subcortical network that might be coordinated by fast oscillatory electrical activity. Previous studies have identified an increase in beta-gamma oscillatory activity after the processing of positive feedback stimuli but the functional role of this electroencephalographic (EEG) correlate remains unclear. In the present study, we used event-related brain potentials (ERPs) and trial-by-trial wavelet-based time-frequency analysis of the EEG signal to investigate the effects of expectancy and magnitude of positive and negative feedbacks associated with monetary gains and losses in a gambling task. Large increase of beta-gamma oscillatory activity only in unexpected monetary gains was observed,irrespective of its magnitude. Based on recent findings we propose that this increase in beta-gamma oscillatory activity might reflect a general cognitive mechanism in charge of monitoring unexpected positive events based on feedback processing.

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Citations

Oct 20, 2012·PloS One·Liam MasonWael El-Deredy
Dec 19, 2013·Journal of Cognitive Neuroscience·Caroline Di Bernardi LuftJoydeep Bhattacharya
Sep 13, 2012·Cognitive, Affective & Behavioral Neuroscience·Gonçalo PadrãoAntoni Rodriguez-Fornells
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Mar 3, 2021·Biological Psychology·Ítalo Alí Diez, Josep Marco-Pallarés
Apr 16, 2019·Behavioural Brain Research·Xing-Jie ChenYoungbin Kwak

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