Preference conditioning alters taste responses in the nucleus of the solitary tract of the rat
| Autor: | Stuart A. McCaughey, Barbara K. Giza, Thomas R. Scott, Karen Ackroff, Anthony Sclafani |
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| Rok vydání: | 1997 |
| Předmět: |
Taste
medicine.medical_specialty Physiology Magnesium Chloride Drinking Behavior Citric Acid Rats Sprague-Dawley Food Preferences chemistry.chemical_compound Physiology (medical) Internal medicine Conditioning Psychological Solitary Nucleus medicine Animals Evoked Potentials Neurons Behavior Animal Solitary nucleus Solitary tract Classical conditioning Stimulation Chemical Rats Electrophysiology Endocrinology chemistry Conditioning Female Aversive Stimulus Citric acid Psychology Neuroscience |
| Zdroj: | American Journal of Physiology-Regulatory, Integrative and Comparative Physiology. 273:R1230-R1240 |
| ISSN: | 1522-1490 0363-6119 |
| DOI: | 10.1152/ajpregu.1997.273.4.r1230 |
| Popis: | Aversive conditioning has an impact on the neural signal for the gustatory conditioned stimulus (CS). Here, we determined whether the code is also affected by preference conditioning. We paired the taste of MgCl2(CS+) with intragastric nutrients in some rats (MG), and citric acid (CS+) with nutrients in others (CI). A control group (Control) experienced both tastants without nutrients. Preferences (>90%) developed for each CS+. We recorded responses to 16 taste stimuli in the nucleus of the solitary tract. Responsiveness of acid-oriented neurons to MgCl2in MG rats was lower than in Controls, and its profile was more distinct from those of acidic and bitter stimuli. Total activity to citric acid was unchanged in CI rats. However, its temporal profile showed a decreased phasic component, making citric acid temporally distinct from nonsugars. Therefore, the responses to both CS+ were modified, each in its own manner, to be more distinct from those of aversive stimuli. The effects of preference conditioning, however, were weaker than those of aversive conditioning. |
| Databáze: | OpenAIRE |
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