Title

Excitotoxic Lesions of the Gustatory Thalamus Spare Simultaneous Contrast Effects But Eliminate Anticipatory Negative Contrast: Evidence against a Memory Deficit

Document Type

Article

Publication Date

4-2004

Keywords

Affect, Animals, Cerebral Cortex, Consummatory Behavior, Functional Laterality, Male, Memory Disorders, Random Allocation, Rats, Rats, Sprague-Dawley, Saccharin, Taste, Thalamus

Digital Object Identifier (DOI)

http://dx.doi.org/10.1037/0735-7044.118.2.365

Abstract

Using consummately contrast procedures and the same taste stimuli (0.15% saccharin and 1.0 M sucrose), the authors tested the hypothesis that lesions of the gustatory thalamus disrupt gustatory memory in 2 experiments. In Experiment 1, irrespective of the duration of the intersolution interval (0 s, 30 s, 1 min, 2 min, 4 min, 8 min), thalamic lesions had no influence on the expression of simultaneous contrast effects. In Experiment 2, thalamic lesions abolished anticipatory negative contrast at the 0-s intersolution interval. These results provide no support for the experimental hypothesis. Rather, the data seem best interpreted as a lesion-induced disruption of the comparison mechanism responsible for anticipatory negative contrast. By this analysis, different comparison mechanisms underlie simultaneous and anticipatory contrast effects.

Comments

Behavioral Neuroscience, V. 118. No. 2, P. 365-376.

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