Location of Repository

Distributed Encoding of Spatial and Object Categories in Primate Hippocampal Microcircuits

By Ioan eOpris, Lucas M Santos, Greg A Gerhardt, Dong eSong, Theodore W Berger, Robert E Hampson and Sam eDeadwyler

Abstract

The primate hippocampus plays critical roles in the encoding, representation, categorization and retrieval of cognitive information. Such cognitive abilities may use the transformational input-output properties of hippocampal laminar microcircuitry to generate spatial representations and to categorize features of objects, images and scenes. Four nonhuman primates were trained in a delayed-match-to-sample (DMS) task while multi-neuron activity was simultaneously recorded from the CA1 and CA3 hippocampal cell fields. Presented results show differential encoding of spatial location and categorization of images presented as relevant stimuli in the task. Individual hippocampal cells encoded visual stimuli only on specific types of trials in which retention of either, the Sample image, or the spatial position of the Sample image was required at the beginning of the trial. Consistent with such encoding, it was shown that patterned microstimulation applied during Sample image presentation facilitated selection of either Sample image spatial locations or types of images, during the Match phase of the task. These findings support the existence of specific codes for spatial and object representations in primate hippocampus which can be applied to differentially signaled trials. Moreover, the transformational properties of hippocampal microcircuitry, together with the patterned microstimulation are supporting the practical importance of this approach for cognitive enhancement and rehabilitation, needed for memory neuroprosthetics

Topics: Hippocampus, CA3, CA1, Cognitive Function, spatial representation, numeric categorization, Neurosciences. Biological psychiatry. Neuropsychiatry, RC321-571
Publisher: Frontiers Media S.A.
Year: 2015
DOI identifier: 10.3389/fnins.2015.00317
OAI identifier: oai:doaj.org/article:7087a82974ff4b3fbcb9314df4c9291c
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/1662-453X (external link)
  • http://journal.frontiersin.org... (external link)
  • https://doaj.org/article/7087a... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.