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The construction of semantic memory: grammar-based representations learned from relational episodic information
Francesco P Battaglia1, Cyriel M A Pennartz
1Center for Neuroscience, Swammerdam Institute for Life Sciences, Universiteit van Amsterdam Amsterdam, Netherlands.
Frontiers in Computational Neuroscience
|September 3, 2011
Summary
This study proposes a new theory for semantic memory formation, modeling it as a stochastic grammar that learns from episodic memory. This computational model explains how sleep replay may facilitate the transformation of episodic experiences into general world knowledge.
Area of Science:
- Neuroscience
- Cognitive Science
- Computational Neuroscience
Background:
- Memory consolidation strengthens memories against interference and injury.
- Memory involves systems-level interactions between the hippocampus (episodic encoding) and neocortex (long-term storage).
- Episodic memory (autobiographical) gradually transforms into semantic memory (facts, world knowledge).
Purpose of the Study:
- To propose a computational theory for semantic memory formation.
- To model the transformation of episodic memory into semantic memory.
- To link theoretical models to neurobiological processes like sleep replay.
Main Methods:
- Episodic memory encoded as relational data.
- Semantic memory modeled as a modified stochastic grammar parsing episodic configurations.
- Expectation-maximization procedure (analogous to inside-outside algorithm) for learning world regularities.
Main Results:
- The grammar generates hierarchical representations of episodes.
- The model learns world regularities from episodic memory data.
- A Monte-Carlo sampling version of the algorithm maps to sleep replay dynamics.
Conclusions:
- The proposed model can explain key properties of semantic memory, including decontextualization and schema creation.
- Sleep replay in the hippocampus and neocortex may implement the learning algorithm.
- This theory provides a computational framework for understanding memory transformation and semantic knowledge acquisition.
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