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Media type:
E-Article
Title:
The Parahippocampal Cortex and its Functional Connection with the Hippocampus are Critical for Nonnavigational Spatial Memory in Macaques
Contributor:
LaFlamme, Elyssa M;
Waguespack, Hannah F;
Forcelli, Patrick A;
Malkova, Ludise
Published:
Oxford University Press (OUP), 2021
Published in:
Cerebral Cortex, 31 (2021) 4, Seite 2251-2267
Language:
English
DOI:
10.1093/cercor/bhaa358
ISSN:
1460-2199;
1047-3211
Origination:
Footnote:
Description:
Abstract The Hamilton Search Task (HST) is a test of nonnavigational spatial memory that is dependent on the hippocampus. The parahippocampal cortex (PHC) is a major route for spatial information to reach the hippocampus, but the extent to which the PHC and hippocampus function independently of one another in the context of nonnavigational spatial memory is unclear. Here, we tested the hypotheses that (1) bilateral pharmacological inactivation of the PHC would impair HST performance, and (2) that functional disconnection of the PHC and hippocampus by contralateral (crossed) inactivation would likewise impair performance. Transient inactivation of the PHC impaired HST performance most robustly with 30 s intertrial delays, but not when color cues were introduced. Functional disconnection of the PHC and hippocampus, but not separate unilateral inactivation of either region, also selectively impaired long-term spatial memory. These findings indicate a critical role for the PHC and its interactions with the hippocampus in nonnavigational spatial memory.