Abstract
Two hypotheses dominate the literature on systems consolidation of episodic memory: the transfer hypothesis and the transformation hypothesis. The former postulates a transfer of episodic memory from a fast-learning hippocampus to a slow-learning neocortex. The latter postulates that only the hippocampus genuinely stores episodic memories, and that systems consolidation arises due to multiple memory traces in the hippocampus and a transformation of episodic into semantic memories. While both hypotheses are supported by some evidence, they are contradicted by other, and hence remain controversial. Here, I suggest a new account of systems consolidation. It is based on the transformation hypothesis and introduces two modifications. First, episodic and semantic memory differ in their representational format, which is optimized for different purposes: Rigid sequences for episodic memories and flexible representations for semantic memory. Second, multiple memory traces in the hippocampus are not required to account for the temporal gradient of retrograde amnesia, if there is any. To this end, slow semantic learning from episodic memories suffices. The main hypothesis that I propose in this chapter is that systems consolidation is an epiphenomenon of semantic learning from episodic memory.
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Notes
- 1.
Interestingly, in the most widely cited article that champions the transfer hypothesis, McClelland et al. (1995) propose that the hippocampus stores single experiences whereas the function of neocortex is “discovering structure”. These ideas are reminiscent of the transformation hypothesis, but the computational models in McClelland et al. assume that the contents of both episodic and semantic memory are very similar, if not identical.
- 2.
I use the term “episodic memory trace” to refer to the quintessential information that is stored in the brain about a particular episode and “episodic memory” to refer to the compound phenomenon that involves the episodic memory trace, but also other components and processes.
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Acknowledgements
I thank Jing Fang and Richard Görler for helpful comments on the manuscript. This work was supported by the German Federal Ministry of Education and Research (BMBF), grant 01GQ1506, and by the Stiftung Mercator.
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Cheng, S. (2017). Consolidation of Episodic Memory: An Epiphenomenon of Semantic Learning. In: Axmacher, N., Rasch, B. (eds) Cognitive Neuroscience of Memory Consolidation. Studies in Neuroscience, Psychology and Behavioral Economics. Springer, Cham. https://doi.org/10.1007/978-3-319-45066-7_4
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