Functional connectivity between memory and reward centers across task and rest track memory sensitivity to reward

Area of Science:

• Neuroscience
• Cognitive Psychology

Background:

• External motivation, particularly monetary rewards, influences memory encoding and retrieval.
• Reward-based memory modulation involves interactions between the dopaminergic midbrain (reward signaling) and the hippocampus/parahippocampal cortex (episodic memory).

Purpose of the Study:

• To investigate if interactions between memory and other reward-related brain regions are linked to reward modulation of memory.
• To determine the temporal stability of these neural relationships.

Main Methods:

• A monetary incentive encoding task assessed individual memory sensitivity to reward.
• Functional connectivity between memory and reward regions was measured pre-task, during-task, and post-task.
• Reward regions included ventral striatum, medial/orbital prefrontal cortex, anterior cingulate cortex, and midbrain, identified via meta-analysis.

Main Results:

• Connectivity between memory and reward regions correlated with individual differences in reward-modulated memory.
• These connectivity patterns remained consistent regardless of measurement timing (pre, during, or post-task).
• Anterior cingulate, orbitofrontal cortex, and ventral striatum connectivity covaried and strongly predicted behavioral outcomes.

Conclusions:

• A wider network of reward regions, beyond the midbrain, is implicated in reward's influence on memory.
• Stable functional connectivity patterns between memory and reward brain centers underlie individual variations in reward-dependent memory modulation.