Processing of spatial and non-spatial information in rats with lesions of the medial and lateral entorhinal cortex: environmental complexity matters
Abstract
The entorhinal-hippocampal circuitry has been suggested to play an important role in episodic memory but the contribution of the entorhinal cortex remains elusive. Predominant theories propose that the medial entorhinal cortex (MEC) processes spatial information whereas the lateral entorhinal cortex (LEC) processes non spatial information. A recent study using an object exploration task has suggested that the involvement of the MEC and LEC spatial and non-spatial information processing could be modulated by the amount of information to be processed, i.e. environmental complexity. To address this hypothesis we used an object exploration task in which rats with excitotoxic lesions of the MEC and LEC had to detect spatial and non-spatial novelty among a set of objects and we varied environmental complexity by decreasing the number of objects or amount of object diversity. Reducing diversity resulted in restored ability to process spatial and non-spatial information in MEC and LEC groups, respectively. Reducing the number of objects yielded restored ability to process non-spatial information in the LEC group but not the ability to process spatial information in the MEC group. The findings indicate that the MEC and LEC are not strictly necessary for spatial and non-spatial processing but that their involvement depends on the complexity of the information to be processed.
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Recognition memory for identical objects is not the same as memory for distinct objects.
“This suggests that the recognition memory for identical objects is not as the same as the memory for distinct 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 Rodo et al., 2017
In the SNOP test, object recognition was compromised when four distinct, but not identical, objects were required to be remembered by LEC-lesioned rats.
“Evidence from the SNOP test has supported this perspective, as object recognition was compromised when four distinct, but not identical, objects were required to be remembered by LEC lesioned rats (Rodo et al., 2017; Van Cauter et al., 2013).”
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 Rodo et al., 2017
MEC-lesioned animals exhibited deficits in spatial recognition when three or four distinct, but not identical, objects were used in the sample trial of the SNOP test.
“The MEC-lesioned animals exhibited deficits in spatial recognition when three or four distinct, but not identical, objects were used in the sample trial of the SNOP test (Rodo et al., 2017).”
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 Rodo et al., 2017
When reducing the diversity of objects to three distinct objects, the LEC-lesioned animals were able to show intact object recognition in the SNOP test.
“When reducing the diversity of objects to three distinct objects, the LEC-lesioned animals were able to show intact object recognition in the SNOP test (Rodo et al., 2017).”
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 Rodo et al., 2017
In the SNOP test, impaired spatial recognition was found after lesion of the MEC.
“In the SNOP test, impaired spatial recognition was found after lesion of the MEC (Rodo et al., 2017; Van Cauter et al., 2013).”
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 Rodo et al., 2017
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- Authors
- Rodo, C., Sargolini, F., & Save, E.
- Affiliations
- Centre National de la Recherche Scientifique (FR)
- ORCID
- Sargolini, Francesca
- Venue
- Behavioural Brain Research
- Publisher
- Elsevier BV
- Published
- 2017-03
- Volume
- 320
- Pages
- 200-209
- ISSN
- 0166-4328 (ISSN-L)
- OpenAlex
- W2560576377
- Cited by
- 42
- References
- 46
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 2 · 2023: 3 · 2022: 7 · 2021: 6 · 2020: 3 · 2019: 5 · 2018: 1 · 2017: 5
- FWCI
- 2.33
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Behavioural Brain Research (publishedVersion)
- PubMed (publishedVersion)
- HAL (submittedVersion)
- 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, spatial data processing, environmental complexity, object exploration, novelty detection, excitotoxic lesions, episodic memory, rats
- MeSH terms
- Animals, Environment, Exploratory Behavior, Hippocampus, Locomotion, Male, Neural Pathways, Spatial Behavior, Time Factors, Statistics, Nonparametric, Entorhinal Cortex, Rats, Long-Evans, Rats
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