Reproduce “Key-value memory in the brain” on OpenResearch
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About this paper
Samuel J. Gershman, Ila Fiete, Kazuki Irie
The authors present memory as separate key and value operations: keys help queries locate memories, while values carry content. They connect this account to machine-learning systems and propose a speculative hippocampal-neocortical division of labor. In a toy classifier, scaling Task 1’s associations restores accuracy from 9% to 99% without retraining; this does not establish the proposed brain mechanism.
Key insights
- Key-value memory allows for the separate optimization of memory representations: keys for maximal discriminability and values for high-fidelity content, addressing distinct computational demands.
- Forgetting in biological memory is primarily attributable to retrieval failure (inaccessible keys), rather than the permanent erasure of stored information (values).
- Metamemory phenomena, like tip-of-the-tongue states, can be explained by the brain assessing a match between a query and a key without fully accessing the associated value.
Summary by alphaXiv.
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