Differential roles of the dorsal hippocampal regions in the acquisition of spatial and temporal aspects of episodic-like memory
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Episodic memory refers to the recollection of what, where and when an event occurred. Computational models suggest that the dentate gyrus (DG) and the CA3 hippocampal subregions are involved in pattern separation and the rapid acquisition of episodes, while CA1 is involved in the formation of a temporal context. Most of the studies performed to test this hypothesis failed to simultaneously address the aspects of episodic memory. Recently, a new task of object recognition was validated in rats. In the first sample trial, the rat is exposed to four copies of an object. In second sample, the rat is exposed to four copies of a different object. In the test trial, two copies of each of the previous objects are presented. One copy of the object used in sample trial one is located in a different place, and it is expected to be the most explored. Our goal was to evaluate whether the pharmacological inactivation of the dorsal DG/CA3 and CA1 subregions could differentially impair the acquisition of the task. Inactivation of the DG/CA3 subregions impaired the spatial discrimination, while the temporal discrimination was preserved. Rats treated with muscimol in CA1 explored all the objects equally well, irrespective of place or presentation time. Our results are consistent with computational models that postulate a role for DG/CA3 in rapid encoding and in spatial pattern separation, and a role for CA1 in the in the formation of the temporal context of events and as well as in detecting spatial novelty.
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Inactivation of the CA3/dentate gyrus spared the when component but not the where component.
“inactivation of the CA3/dentate gyrus spared the when component, but not the where component”
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 Barbosa et al., 2012
Pharmacological muscimol microinjections into the hippocampal CA1 area disrupted the where and when components.
“Pharmacological muscimol microinjections into the hippocampal CA1area disrupted the where and when components”
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 Barbosa et al., 2012
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- Authors
- Barbosa, F. F., de Oliveira Pontes, I. M., Ribeiro, S., Ribeiro, A. M., & Silva, R. H.
- Affiliations
- Universidade Federal do Rio Grande do Norte (BR)
- Corresponding author
- Silva, Regina Helena
- Venue
- Behavioural Brain Research
- Publisher
- Elsevier BV
- Published
- 2012-06
- Volume
- 232
- Issue
- 1
- Pages
- 269-277
- ISSN
- 0166-4328 (ISSN-L)
- OpenAlex
- W2033499925
- Cited by
- 71
- References
- 44
- Citations by year
- 2026: 3 · 2024: 3 · 2023: 3 · 2022: 12 · 2021: 6 · 2020: 5 · 2019: 3 · 2018: 8 · 2017: 5 · 2016: 2 · 2015: 7 · 2014: 8 · 2013: 6
- FWCI
- 3.44
- Type
- journal article
- Language
- en
- Open access
- green
- repositorio.ufrn.br
- Licence
- Locations
- Behavioural Brain Research (publishedVersion)
- PubMed (publishedVersion)
- LA Referencia (Red Federada de Repositorios Institucionales de Publicaciones Científicas) (publishedVersion, other-oa)
- Americanae (AECID Library) (submittedVersion, other-oa)
- Funders
- Fundação de Apoio à Pesquisa do Rio Grande do Norte
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Conselho Nacional de Desenvolvimento Científico e Tecnológico
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
- Keywords
- episodic-like memory, dorsal hippocampus, dentate gyrus, CA3, CA1, spatial discrimination, temporal discrimination, object recognition memory, muscimol inactivation, pattern separation, temporal context, rats
- MeSH terms
- Analysis of Variance, Animals, Behavior, Animal, Data Interpretation, Statistical, Exploratory Behavior, Hippocampus, Injections, Male, Muscimol, Space Perception, Stereotaxic Techniques, Time Perception, Rats, Wistar, GABA Agonists, Rats, Long-Evans, Rats, CA1 Region, Hippocampal, CA3 Region, Hippocampal, Memory, Episodic
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