Selectivity in Postencoding Connectivity with High-Level Visual Cortex Is Associated with Reward-Motivated Memory.

Area of Science:

• Neuroscience
• Cognitive Psychology
• Neuroimaging

Background:

• Reward motivation enhances memory consolidation, but the mechanisms for selective memory processing remain unclear.
• High-value information is prioritized in memory, even when intermixed with lower-value information.
• Understanding how the brain selects information for consolidation based on reward is crucial for memory research.

Purpose of the Study:

• To investigate how differential reward motivation influences the selectivity of postencoding memory consolidation.
• To identify neural markers of systems-level memory consolidation associated with reward value.
• To determine if postencoding connectivity patterns predict memory for high- versus low-reward information.

Main Methods:

• Functional magnetic resonance imaging (fMRI) was used to monitor brain activity during memory encoding.
• Participants encoded intermixed high- and low-reward trial-unique memoranda.
• Postencoding connectivity patterns between brain regions were analyzed in relation to subsequent memory recall.

Main Results:

• Reward motivation significantly enhanced 24-hour associative memory.
• Increased connectivity between category-selective visual cortex, the ventral tegmental area (VTA), and the anterior hippocampus predicted memory for high-reward items.
• These effects were observed during postencoding rest periods, independent of encoding activity.

Conclusions:

• Postencoding interactions between sensory cortex and memory systems, modulated by reward, support the selective stabilization of memories for salient events.
• This study reveals a novel mechanism for reward-guided memory consolidation involving mesolimbic dopamine pathways, episodic memory, and perception.
• The findings support a model where reward value influences memory prioritization through experience-dependent neural plasticity after learning.