Major Dissociation Between Medial and Lateral Entorhinal Input to Dorsal Hippocampus
Abstract
Hippocampal place cells are a model system of how the brain constructs cognitive representations and of how these representations support complex behavior, learning, and memory. There is, however, a lack of detailed knowledge about the properties of hippocampal afferents. We recorded multiple single units from the hippocampus and the medial and lateral entorhinal areas of behaving rats. Although many medial entorhinal neurons had highly specific place fields, lateral entorhinal neurons displayed weak spatial specificity. This finding demonstrates a fundamental dissociation between the information conveyed to the hippocampus by its major input streams, with spatial information represented by the medial and nonspatial information represented by the lateral entorhinal cortex.
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CA2 pyramidal neurons integrate synaptic input from lateral entorhinal cortex, which conveys non-spatial information, with subcortical input from the serotonergic median raphe nucleus and the hypothalamic supramammillary nucleus.
“The finding that CA2 PNs integrate synaptic input from lateral EC (which conveys non-spatial information18) with subcortical input from both the serotonergic median raphe nucleus19 and the hypothalamic supramammillary nucleus20”
From The hippocampal CA2 region is essential for social memory (2014) · cites this paper as [18]
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- Authors
- Hargreaves, E. L., Rao, G., Lee, I., & Knierim, J. J.
- Affiliations
- New York University (US)
- Corresponding author
- Lee, Inah
- Knierim, James J.
- Venue
- Science
- Published
- 2005-06-17
- Volume
- 308
- Issue
- 5729
- Pages
- 1792-1794
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2018196751
- Cited by
- 685
- References
- 0
- Citations by year
- 2026: 11 · 2025: 28 · 2024: 30 · 2023: 21 · 2022: 33 · 2021: 32 · 2020: 44 · 2019: 26 · 2018: 38 · 2017: 45 · 2016: 26 · 2015: 34 · 2014: 52 · 2013: 46 · 2012: 29
- FWCI
- 16.05
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institute of Mental Health (K02 MH-63297, K02MH063297)
- National Institute of Neurological Disorders and Stroke (R01NS039456)
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Physical Sciences › Engineering › Automotive Engineering › Spatial Cognition and Navigation
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Keywords
- medial entorhinal cortex, lateral entorhinal cortex, dorsal hippocampus, place cells, place fields, hippocampal afferents, spatial representation, single-unit recording, rats
- MeSH terms
- Animals, Behavior, Animal, Brain Mapping, Cues, Electrodes, Implanted, Hippocampus, Learning, Male, Neural Pathways, Neurons, Pyramidal Cells, Entorhinal Cortex, Rats, Long-Evans, Rats
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