Hippocampal CA2 activity patterns change over time to a larger extent than between spatial contexts
Open accessAbstract
The hippocampal CA2 subregion has a different anatomical connectivity pattern within the entorhino-hippocampal circuit than either the CA1 or CA3 subregion. Yet major differences in the neuronal activity patterns of CA2 compared with the other CA subregions have not been reported. We show that standard spatial and temporal firing patterns of individual hippocampal principal neurons in behaving rats, such as place fields, theta modulation, and phase precession, are also present in CA2, but that the CA2 subregion differs substantially from the other CA subregions in its population coding. CA2 ensembles do not show a persistent code for space or for differences in context. Rather, CA2 activity patterns become progressively dissimilar over time periods of hours to days. The weak coding for a particular context is consistent with recent behavioral evidence that CA2 circuits preferentially support social, emotional, and temporal rather than spatial aspects of memory.
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Hippocampal place cells show sensitivity to timescales of days to weeks, and such sensitivity has also been observed independently of place coding.
“Sensitivity to longer timescales on the order of days to weeks has also been observed in hippocampal place cells [10–12] and independently of place coding [13,14].”
From Does mental context drift or shift? (2017) · cites this paper as [14]
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- Authors
- Mankin, E. A., Diehl, G. W., Sparks, F. T., Leutgeb, S., & Leutgeb, J. K.
- Affiliations
- University of California San Diego (US)
- University of Lethbridge (CA)
- Corresponding author
- Leutgeb, Jill K.
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 2015-01
- Volume
- 85
- Issue
- 1
- Pages
- 190-201
- ISSN
- 0896-6273 (ISSN-L)
- PMC
- PMC4392894
- OpenAlex
- W2071678249
- Cited by
- 279
- References
- 64
- Citations by year
- 2026: 14 · 2025: 23 · 2024: 20 · 2023: 24 · 2022: 21 · 2021: 26 · 2020: 34 · 2019: 27 · 2018: 28 · 2017: 29 · 2016: 23 · 2015: 9
- FWCI
- 17.85
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute on Aging (P50AG005131)
- National Institute of Mental Health (T32MH020002, R01MH100349)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Keywords
- hippocampal CA2, place fields, theta modulation, phase precession, population coding, spatial context, social memory, emotional memory, temporal memory
- MeSH terms
- Action Potentials, Animals, Behavior, Animal, Emotions, Male, Memory, Neurons, Theta Rhythm, Time Factors, Entorhinal Cortex, Rats, CA1 Region, Hippocampal, CA2 Region, Hippocampal, CA3 Region, Hippocampal
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