Cognitive demands induce selective hippocampal reorganization: Arc expression in a place and response task

Brandy Schmidt, Elham Satvat, Melissa Argraves, Etan J. Markus, Diano F. Marrone

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

Place cells in the hippocampus can maintain multiple representations of a single environment and respond to physical and/or trajectory changes by remapping. Within the hippocampus there are anatomical, electrophysiological, and behavioral dissociations between the dorsal and ventral hippocampus and within dorsal CA1. Arc expression was used to measure the recruitment of ensembles across different hippocampal subregions in rats trained to utilize two different cognitive strategies while traversing an identical trajectory. This behavioral paradigm allowed for the measurement of remapping in the absence of changes in external cues, trajectory traversed (future/past), running speed, motivation, or different stages of learning. Changes in task demands induced remapping in only some hippocampal regions: reorganization of cell ensembles was observed in dorsal CA1 but not in dorsal CA3. Moreover, a gradient was found in the degree of remapping within dorsal CA1 that corresponds to entorhinal connectivity to this region. Remapping was not seen in the ventral hippocampus: neither ventral CA1 nor CA3 exhibited ensemble changes with different cognitive demands. This contrasts with findings of remapping in both the dorsal and ventral dentate gyrus using this task. The results suggest that the dorsal pole of the hippocampus is more sensitive to changes in task demands.

Original languageEnglish (US)
Pages (from-to)2114-2126
Number of pages13
JournalHippocampus
Volume22
Issue number11
DOIs
StatePublished - Nov 1 2012

Keywords

  • CA1
  • CA3
  • IEG
  • Place cells
  • Remapping

Fingerprint Dive into the research topics of 'Cognitive demands induce selective hippocampal reorganization: Arc expression in a place and response task'. Together they form a unique fingerprint.

  • Cite this

    Schmidt, B., Satvat, E., Argraves, M., Markus, E. J., & Marrone, D. F. (2012). Cognitive demands induce selective hippocampal reorganization: Arc expression in a place and response task. Hippocampus, 22(11), 2114-2126. https://doi.org/10.1002/hipo.22031