Dysgranular retrosplenial cortex lesions in rats disrupt cross-modal object recognition

Hindley, Emma L., Nelson, Andrew J. D. ORCID: https://orcid.org/0000-0002-5171-413X, Aggleton, John P. ORCID: https://orcid.org/0000-0002-5573-1308 and Vann, Seralynne D. ORCID: https://orcid.org/0000-0002-6709-8773 2014. Dysgranular retrosplenial cortex lesions in rats disrupt cross-modal object recognition. Learning and Memory 21 (3) , pp. 171-179. 10.1101/lm.032516.113

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Abstract

The retrosplenial cortex supports navigation, with one role thought to be the integration of different spatial cue types. This hypothesis was extended by examining the integration of nonspatial cues. Rats with lesions in either the dysgranular subregion of retrosplenial cortex (area 30) or lesions in both the granular and dysgranular subregions (areas 29 and 30) were tested on cross-modal object recognition (Experiment 1). In these tests, rats used different sensory modalities when exploring and subsequently recognizing the same test objects. The objects were first presented either in the dark, i.e., giving tactile and olfactory cues, or in the light behind a clear Perspex barrier, i.e., giving visual cues. Animals were then tested with either constant combinations of sample and test conditions (light to light, dark to dark), or changed “cross-modal” combinations (light to dark, dark to light). In Experiment 2, visual object recognition was tested without Perspex barriers, but using objects that could not be distinguished in the dark. The dysgranular retrosplenial cortex lesions selectively impaired cross-modal recognition when cue conditions switched from dark to light between initial sampling and subsequent object recognition, but no impairment was seen when the cue conditions remained constant, whether dark or light. The combined (areas 29 and 30) lesioned rats also failed the dark to light cross-modal problem but this impairment was less selective. The present findings suggest a role for the dysgranular retrosplenial cortex in mediating the integration of information across multiple cue types, a role that potentially applies to both spatial and nonspatial domains.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Psychology Medicine Neuroscience and Mental Health Research Institute (NMHRI)
Subjects:	R Medicine > RC Internal medicine > RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry
Additional Information:	This is an open access article under the terms of the CC-BY license.
Publisher:	Cold Spring Harbor Laboratory Press
ISSN:	1072-0502
Funders:	BBSRC
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	9 December 2013
Last Modified:	07 Nov 2023 11:18
URI:	https://orca.cardiff.ac.uk/id/eprint/58244

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