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Bilateral lesions in a specific subregion of posterior insular cortex impair conditioned taste aversion expression in rats.

Title: Bilateral lesions in a specific subregion of posterior insular cortex impair conditioned taste aversion expression in rats.
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Name(s): Schier, Lindsey A, author
Blonde, Ginger D, author
Spector, Alan C, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2016-01-01
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The gustatory cortex (GC) is widely regarded for its integral role in the acquisition and retention of conditioned taste aversions (CTAs) in rodents, but large lesions in this area do not always result in CTA impairment. Recently, using a new lesion mapping system, we found that severe CTA expression deficits were associated with damage to a critical zone that included the posterior half of GC in addition to the insular cortex (IC) that is just dorsal and caudal to this region (visceral cortex). Lesions in anterior GC were without effect. Here, neurotoxic bilateral lesions were placed in the anterior half of this critical damage zone, at the confluence of the posterior GC and the anterior visceral cortex (termed IC2 ), the posterior half of this critical damage zone that contains just VC (termed IC3), or both of these subregions (IC2 + IC3). Then, pre- and postsurgically acquired CTAs (to 0.1 M NaCl and 0.1 M sucrose, respectively) were assessed postsurgically in 15-minute one-bottle and 96-hour two-bottle tests. Li-injected rats with histologically confirmed bilateral lesions in IC2 exhibited the most severe CTA deficits, whereas those with bilateral lesions in IC3 were relatively normal, exhibiting transient disruptions in the one-bottle sessions. Groupwise lesion maps showed that CTA-impaired rats had more extensive damage to IC2 than did unimpaired rats. Some individual differences in CTA expression among rats with similar lesion profiles were observed, suggesting idiosyncrasies in the topographic representation of information in the IC. Nevertheless, this study implicates IC2 as the critical zone of the IC for normal CTA expression.
Identifier: FSU_pmch_26053891 (IID), 10.1002/cne.23822 (DOI), PMC4659750 (PMCID), 26053891 (RID), 26053891 (EID)
Keywords: Brain mapping, Gustatory cortex, Taste learning, Visceral cortex
Grant Number: F32 DC013494, R01 DC009821, T32 DC000044
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4659750.
Subject(s): Animals
Avoidance Learning/physiology
Cerebral Cortex/drug effects
Cerebral Cortex/pathology
Cerebral Cortex/physiology
Cerebral Cortex/physiopathology
Choice Behavior/physiology
Conditioning (Psychology)/physiology
Dietary Sucrose
Food Preferences/physiology
Ibotenic Acid/toxicity
Male
Neuropsychological Tests
Rats, Sprague-Dawley
Sodium Chloride, Dietary
Taste Perception/physiology
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_26053891
Owner Institution: FSU
Is Part Of: The Journal of comparative neurology.
1096-9861
Issue: iss. 1, vol. 524

Choose the citation style.
Schier, L. A., Blonde, G. D., & Spector, A. C. (2016). Bilateral lesions in a specific subregion of posterior insular cortex impair conditioned taste aversion expression in rats. The Journal Of Comparative Neurology. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_26053891