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

Hippocampus
Brandy SchmidtDiano F Marrone

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 dentat...Continue Reading

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Citations

May 21, 2014·PloS One·Lauren L LongJames J Chrobak
Feb 22, 2013·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Andrea L HartzellCarol A Barnes
Jan 1, 2014·Hippocampus·Darlene M SkinnerDiano F Marrone
Sep 16, 2014·Hippocampus·Diano F MarroneAli Gheidi
Aug 19, 2015·Neurobiology of Aging·Inês Tomás PereiraPeter R Rapp
Jun 13, 2015·Neuropsychopharmacology : Official Publication of the American College of Neuropsychopharmacology·Antoine Besnard, Amar Sahay
Mar 7, 2018·Learning & Behavior·S L WrightD M Skinner
Jun 9, 2018·Proceedings of the National Academy of Sciences of the United States of America·Kendrick J JonesWeifeng Xu

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