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. 2024 Sep;61(9):e14594.
doi: 10.1111/psyp.14594. Epub 2024 May 1.

The neural correlates of reinforcement sensitivity theory: A systematic review of the frontal asymmetry and spectral power literature

Jennifer Firth  1 , Bradley Standen  1 , Alexander Sumich  1 , Emanuele Fino  1 , Nadja Heym  1
Affiliations

The neural correlates of reinforcement sensitivity theory: A systematic review of the frontal asymmetry and spectral power literature

Jennifer Firth et al. Psychophysiology. 2024 Sep.

Abstract

The original Reinforcement Sensitivity Theory (oRST) proposes two systems of approach (BAS) and avoidance (BIS) motivation to underpin personality and behavior. The revised-RST (rRST) model separates avoidance motivation into passive (BIS; anxiety) and active (FFFS; fear) systems. Prior research has attempted to map RST onto lateralized frontal asymmetry to provide a neurophysiological marker of RST. The main aim is to examine the relationships of the o/rRST scales with trait (baseline) and state (manipulated through experimental paradigms) frontal asymmetry. A systematic review was conducted, resulting in 158 studies designated to neuroimaging research. In total, 54 studies were included in this review using either frontal asymmetry or spectral power. The results were split into three main categories: resting frontal alpha asymmetry (N = 23), emotional induction and state-related frontal alpha asymmetry (N = 20), and spectral analysis (N = 16). Findings indicated that BAS was associated with enhanced left frontal asymmetry at baseline and during state-related paradigms. Findings for BIS were more inconsistent, especially at rest, suggesting that BIS, in particular, may require active engagement with the environment. Only 9 of the 54 papers included used the revised RST model, highlighting the need for more rRST research.

Keywords: emotion; frontal asymmetry; motivation; reinforcement sensitivity theory; spectral power; systematic review.

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