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Dysgranular Retrosplenial Cortex Lesions in Rats Disrupt Cross-Modal Object Recognition

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Title: Dysgranular Retrosplenial Cortex Lesions in Rats Disrupt Cross-Modal Object Recognition
Authors: Hindley, Emma L., Nelson, Andrew J. D., Aggleton, John P.
Source: Learning & Memory. Mar 2014 21(3):171-179.
Availability: Cold Spring Harbor Laboratory Press. 500 Sunnyside Boulevard, Woodbury, NY 11797-2924. Tel: 800-843-4388; Tel: 516-367-8800; Fax: 516-422-4097; e-mail: cshpres@cshl.edu; Web site: http://www.learnmem.org/
Peer Reviewed: Y
Page Count: 9
Publication Date: 2014
Document Type: Journal Articles
Reports - Research
Descriptors: Brain Hemisphere Functions, Animals, Cues, Hypothesis Testing, Recognition (Psychology), Sensory Experience, Visual Stimuli, Olfactory Perception, Tactual Perception, Learning Processes, Neurological Impairments, Cognitive Psychology
DOI: 10.1101/lm.032516.113
ISSN: 1072-0502
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.
Abstractor: As Provided
Number of References: 44
Entry Date: 2014
Accession Number: EJ1027262
Database: ERIC
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  Data: Dysgranular Retrosplenial Cortex Lesions in Rats Disrupt Cross-Modal Object Recognition
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  Data: <searchLink fieldCode="AR" term="%22Hindley%2C+Emma+L%2E%22">Hindley, Emma L.</searchLink><br /><searchLink fieldCode="AR" term="%22Nelson%2C+Andrew+J%2E+D%2E%22">Nelson, Andrew J. D.</searchLink><br /><searchLink fieldCode="AR" term="%22Aggleton%2C+John+P%2E%22">Aggleton, John P.</searchLink>
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  Data: Cold Spring Harbor Laboratory Press. 500 Sunnyside Boulevard, Woodbury, NY 11797-2924. Tel: 800-843-4388; Tel: 516-367-8800; Fax: 516-422-4097; e-mail: cshpres@cshl.edu; Web site: http://www.learnmem.org/
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  Data: 10.1101/lm.032516.113
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  Data: 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.
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