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A model of bi-directional interactions between complementary learning systems for memory consolidation of sequential
Michael D Howard1, Steven W Skorheim1, Praveen K Pilly1
1Proficient Autonomy Center, Intelligent Systems Laboratory, HRL Laboratories, Malibu, CA, United States.
Frontiers in Systems Neuroscience
|October 31, 2022
Summary
A new computational model reveals how the hippocampus and cortex interact during sleep to consolidate sequential memories. Event salience influences memory replay, impacting consolidation and memory competition.
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Modeling
Background:
- Memory consolidation involves transferring information from the hippocampus to the cortex.
- Existing models often overlook the sequential nature of episodic memories and bidirectional interactions.
- The role of hippocampal learning during sleep in consolidating temporal sequences is not fully understood.
Purpose of the Study:
- To develop a computational model of memory consolidation for temporal sequences.
- To investigate the dynamics of bidirectional hippocampal-cortical interactions and time-compressed replays.
- To explore the impact of hippocampal learning and event salience on memory consolidation.
Main Methods:
- Developed a computational model simulating memory encoding, consolidation, and recall for temporal sequences.
- Conducted four simulation experiments to analyze network dynamics.
- Incorporated bidirectional interaction between the hippocampus and cortex, including time-compressed replays.
Main Results:
- Event salience (recency, frequency) significantly impacts memory consolidation by biasing offline cortical cueing.
- The model demonstrates how new and old memories compete for limited replay opportunities.
- Hippocampal learning during sleep can refresh memory traces if competing experiences are absent.
Conclusions:
- Bidirectional hippocampal-cortical interactions and time-compressed replays are crucial for consolidating sequential memories.
- Event salience plays a key role in memory consolidation dynamics.
- Hippocampal learning during sleep is beneficial for memory consolidation, provided there is no interference from competing memories.
Keywords:
complementary learning systemsepisodic memorieshippocampusmemory consolidationneocortexreplaysMore Related Videos
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