Excitotoxic Lesions of the Gustatory Thalamus Spare Simultaneous Contrast Effects But Eliminate Anticipatory Negative Contrast: Evidence against a Memory Deficit
Affect, Animals, Cerebral Cortex, Consummatory Behavior, Functional Laterality, Male, Memory Disorders, Random Allocation, Rats, Rats, Sprague-Dawley, Saccharin, Taste, Thalamus
Digital Object Identifier (DOI)
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.
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Scholar Commons Citation
Reilly, Steve; Bornovalova, Marina; and Trifunovic, Radmila, "Excitotoxic Lesions of the Gustatory Thalamus Spare Simultaneous Contrast Effects But Eliminate Anticipatory Negative Contrast: Evidence against a Memory Deficit" (2004). Psychology Faculty Publications. 147.