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Title: Temporally selective contextual encoding in the dentate gyrus of the hippocampus

Journal Article · · Nature Communications
DOI:https://doi.org/10.1038/ncomms4181· OSTI ID:1623933
 [1];  [2];  [3];  [4];  [1];  [5];  [2]
  1. Univ. of California, San Diego, CA (United States). program in Neurosciences; Salk Institute for Biological Studies, La Jolla, CA (United States)
  2. Univ. of California, San Diego, CA (United States). Dept. of Cognitive Science
  3. Salk Institute for Biological Studies, La Jolla, CA (United States)
  4. Univ. of Queensland, Brisbane, QLD (Australia). School of Information Technology and Electrical Engineering
  5. Univ. of California, San Diego, CA (United States). program in Neurosciences; Univ. of California, San Diego, CA (United States). Dept. of Cognitive Science

A recent model of the hippocampus predicts that the unique properties of the dentate gyrus allow for temporal separation of events. This temporal separation is accomplished in part through the continual generation of new neurons, which, due to a transient window of hyperexcitability, could allow for preferential encoding of information present during their development. Here we obtain in vivo electrophysiological recordings and identify a cell population exhibiting activity that is selective to single contexts when rats experience a long temporal separation between context exposures during training. This selectivity is attenuated as the temporal separation between context exposures is shortened and is further attenuated when neurogenesis is reduced. Our data reveal the existence of a temporal orthogonalizing neuronal code within the dentate gyrus, a hallmark feature of episodic memory.

Research Organization:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division; National Science Foundation (NSF)
Grant/Contract Number:
NA0003525; SBE 0542013
OSTI ID:
1623933
Journal Information:
Nature Communications, Vol. 5, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (23)

The Computational Nature of Memory Modification journal September 2016
The computational nature of memory modification journal March 2017
Adult-born dentate granule cell excitability depends on the interaction of neuron age, ontogenetic age and experience journal May 2018
Functions of adult-born neurons in hippocampal memory interference and indexing journal September 2019
Adult Hippocampal Neurogenesis in Parkinson’s Disease: Impact on Neuronal Survival and Plasticity journal January 2014
Adult Hippocampal Neurogenesis: Regulation and Possible Functional and Clinical Correlates journal June 2018
Young adult born neurons enhance hippocampal dependent performance via influences on bilateral networks journal December 2016
Transcending time in the brain: How event memories are constructed from experience journal February 2019
Adult hippocampal neurogenesis and cognitive flexibility — linking memory and mood journal May 2017
Modeling of Brain-Like Concept Coding with Adulthood Neurogenesis in the Dentate Gyrus journal November 2019
Time cells in the hippocampus: a new dimension for mapping memories journal October 2014
Image-guided cranial irradiation-induced ablation of dentate gyrus neurogenesis impairs extinction of recent morphine reward memories journal February 2019
Modeling Contextual Modulation of Memory Associations in the Hippocampus journal November 2018
A shared representation of order between encoding and recognition in visual short-term memory journal July 2017
Adult Neurogenesis and the Future of the Rejuvenating Brain Circuits journal April 2015
Low excitatory innervation balances high intrinsic excitability of immature dentate neurons journal April 2016
Attenuated Late-PhaseArcTranscription in the Dentate Gyrus of Mice LackingEgr3 journal January 2017
Adult hippocampal neurogenesis poststroke: More new granule cells but aberrant morphology and impaired spatial memory journal September 2017
Reading positional codes with fMRI: Problems and solutions. journalarticle January 2017
Neuroactive Steroids Reverse Tonic Inhibitory Deficits in Fragile X Syndrome Mouse Model journal February 2019
Theta and beta oscillatory dynamics in the dentate gyrus reveal a shift in network processing state during cue encounters journal July 2015
Age-related changes in dentate gyrus cell numbers, neurogenesis, and associations with cognitive impairments in the rhesus monkey journal July 2015
Correction: The computational nature of memory modification journal May 2017

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