Brain Activation Features in Response to the Expectation of Receiving Rewards Through Aggression

Area of Science:

• Neuroscience
• Cognitive Psychology
• Social Psychology

Background:

• Reward expectation is a key motivator for aggression.
• The neural underpinnings of aggressive reward expectation are not well understood.
• Previous research has primarily focused on behavioral aspects.

Purpose of the Study:

• To investigate the brain activity associated with expecting rewards for aggressive actions.
• To explore the relationship between monetary reward, aggression, and neural activation.
• To examine the role of moral disengagement in aggressive decision-making.

Main Methods:

• Developed the Harm-Gain Task (HGT) to study aggressive reward expectation.
• Used functional magnetic resonance imaging (fMRI) to measure brain activity in 32 healthy university students.
• Administered a questionnaire to assess moral disengagement related to aggressive choices.

Main Results:

• During reward anticipation, the orbitofrontal cortex (OFC) and anterior cingulate cortex (ACC) showed increased activation, while the dorsolateral prefrontal cortex (DLPFC), inferior parietal lobule (IPL), and lateral temporal cortex (LTC) showed decreased activation.
• Higher monetary rewards led to greater activation in the OFC and ACC and reduced activation in the DLPFC, IPL, and LTC.
• Increased OFC and ACC activation correlated with higher levels of aggressive behavior and moral disengagement.

Conclusions:

• The study identified specific brain regions involved in aggressive reward expectation.
• Findings suggest a neural basis for how anticipated rewards influence aggressive tendencies.
• This research provides a foundation for further investigation into the cognitive and neural mechanisms of aggression.