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Science. 2018 Jan 12;359(6372):213-218. doi: 10.1126/science.aao3898.

Spatial representations of self and other in the hippocampus.

Author information

1
Laboratory for Systems Neurophysiology, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
2
Laboratory for Neural Computation and Adaptation, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
3
Laboratory for Systems Neurophysiology, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan. fujisawa@brain.riken.jp.

Abstract

An animal's awareness of its location in space depends on the activity of place cells in the hippocampus. How the brain encodes the spatial position of others has not yet been identified. We investigated neuronal representations of other animals' locations in the dorsal CA1 region of the hippocampus with an observational T-maze task in which one rat was required to observe another rat's trajectory to successfully retrieve a reward. Information reflecting the spatial location of both the self and the other was jointly and discretely encoded by CA1 pyramidal cells in the observer rat. A subset of CA1 pyramidal cells exhibited spatial receptive fields that were identical for the self and the other. These findings demonstrate that hippocampal spatial representations include dimensions for both self and nonself.

PMID:
29326273
DOI:
10.1126/science.aao3898
[Indexed for MEDLINE]

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