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Recent and remote retrograde memory deficit in rats with medial entorhinal cortex lesions
Open accessAbstract
The hippocampus is critically involved in the acquisition and retrieval of spatial memories. Even though some memories become independent of the hippocampus over time, expression of spatial memories have consistently been found to permanently depend on the hippocampus. Recent studies have focused on the adjacent medial entorhinal cortex (MEC), as it provides major projections to the hippocampus. These studies have shown that lesions of the MEC disrupt spatial processing in the hippocampus and impair spatial memory acquisition on the watermaze task. MEC lesions acquired after learning the watermaze task also disrupt recently acquired spatial memories. However, the effect of MEC lesions on remotely acquired memories is unknown. The current study examined the effect of MEC lesions on recent and remote memory retrieval using three hippocampus-dependent tasks: the watermaze, trace fear conditioning, and novel object recognition. MEC lesions caused impaired retrieval of recently and remotely acquired memory for the watermaze. Rats with MEC lesions also showed impaired fear memory when exposed to the previously conditioned context or the associated tone, and this reduction was seen both when the lesion occurred soon after trace fear condition and when it occurred a month after conditioning. In contrast, MEC lesions did not disrupt novel object recognition. These findings indicate that even with an intact hippocampus, rats with MEC lesions cannot retrieve recent or remote spatial memories. In addition, the involvement of the MEC in memory extends beyond is role in navigation and place memory.
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The MEC is engaged in the processing of "general" information about space and its interaction with the hippocampus, particularly in situations with increased complexity of objects.
“These data illustrate the engagement of the MEC in the processing of “general” information about space and its interaction with the hippocampus (Hales et al., 2014; Hales et al., 2018), particularly in situation with increased complexity of objects.”
From The medial prefrontal cortex - hippocampus circuit that integrates information of object, place and time to construct episodic memory in rodents: Behavioral, anatomical and neurochemical properties (2020) · cites this paper as Hales et al., 2018
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Hippocampal–Cortical Circuits and Memory
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Metadata
- Authors
- Hales, J. B., Vincze, J. L., Reitz, N. T., Ocampo, A. C., Leutgeb, S., & Clark, R. E.
- Affiliations
- University of San Diego (US)
- University of California San Diego (US)
- Corresponding author
- Hales, Jena B.
- Clark, Robert E.
- Venue
- Neurobiology of Learning and Memory
- Publisher
- Elsevier BV
- Published
- 2018-11
- Volume
- 155
- Pages
- 157-163
- ISSN
- 1074-7427 (ISSN-L)
- PMC
- PMC6544028
- OpenAlex
- W2887074696
- Cited by
- 33
- References
- 52
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 4 · 2023: 8 · 2022: 3 · 2021: 6 · 2020: 5 · 2019: 4
- FWCI
- 2.23
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Neurobiology of Learning and Memory (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Funders
- University of California, San Diego
- National Institutes of Health (NS086947)
- National Science Foundation
- College of Arts and Letters, San Diego State University
- U.S. Department of Veterans Affairs
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Social Sciences › Psychology › Experimental and Cognitive Psychology › Spatial Cognition and Navigation
- Keywords
- medial entorhinal cortex, retrograde amnesia, remote memory retrieval, spatial memory, hippocampal-dependent memory, water maze, trace fear conditioning, novel object recognition, hippocampal projections, rats
- MeSH terms
- Animals, Behavior, Animal, Hippocampus, Male, Memory Disorders, Memory, Short-Term, Entorhinal Cortex, Maze Learning, Rats, Long-Evans, Recognition, Psychology, Rats, Memory, Long-Term, Spatial Memory
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