Place Cells and Place Recognition Maintained by Direct Entorhinal-Hippocampal Circuitry

Author:

Brun Vegard H.1,Otnæss Mona K.1,Molden Sturla1,Steffenach Hill-Aina1,Witter Menno P.2,Moser May-Britt1,Moser Edvard I.1

Affiliation:

1. Neuroscience Unit, Medical-Technical Research Centre, Norwegian University of Science and Technology, 7489 Trondheim, Norway.

2. Research Institute Neurosciences, Department of Anatomy, Vrije Universiteit Medical Center, Amsterdam, Netherlands.

Abstract

Place cells in hippocampal area CA1 may receive positional information from the intrahippocampal associative network in area CA3 or directly from the entorhinal cortex. To determine whether direct entorhinal connections support spatial firing and spatial memory, we removed all input from areas CA3 to CA1, thus isolating the CA1 area. Pyramidal cells in the isolated CA1 area developed sharp and stable place fields. Rats with an isolated CA1 area showed normal acquisition of an associative hippocampal-dependent spatial recognition task. Spatial recall was impaired. These results suggest that the hippocampus contains two functionally separable memory circuits: The direct entorhinal-CA1 system is sufficient for recollection-based recognition memory, but recall depends on intact CA3-CA1 connectivity.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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