Cited by 71Memory and Neural MechanismsMemory Processes and InfluencesNeurogenesis and neuroplasticity mechanisms

Differential roles of the dorsal hippocampal regions in the acquisition of spatial and temporal aspects of episodic-like memory

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Barbosa, Flávio Freitas, de Oliveira Pontes, Isabella Maria, Ribeiro, Sidarta, Ribeiro, Alessandra Mussi, Silva, Regina Helena·2012·Behavioural Brain Research

Abstract

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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Crossref · 10.1016/j.bbr.2012.04.022

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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
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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