Shared and unique neural circuitry underlying temporally unpredictable threat and reward processing

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Neuroimaging

Background:

• Temporally unpredictable stimuli impact behavior across species.
• Frontolimbic circuits are implicated in anticipating unpredictable threat (U-threat).
• Neural mechanisms for unpredictable reward (U-reward) anticipation and overlapping systems remain unclear.

Purpose of the Study:

• Investigate the neural mechanisms of U-reward anticipation.
• Determine if U-threat and U-reward processing involve overlapping or distinct neural systems.
• Clarify the neural basis of responding to uncertainty.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used.
• Data from 159 young adults were analyzed.
• Neural activation patterns during anticipation of U-threat and U-reward were compared.

Main Results:

• Both U-threat and U-reward anticipation activated the right anterior insula, right ventral anterior nucleus of the thalamus, and right inferior frontal gyrus.
• U-threat uniquely activated the right posterior insula and dorsal anterior cingulate cortex.
• U-reward uniquely activated the right fusiform and left middle occipital gyrus.

Conclusions:

• Anticipation of U-threat and U-reward share some neural circuitry.
• Distinct neural circuits largely mediate the processing of U-threat and U-reward.
• Further research is needed to validate and expand these findings on uncertainty processing.