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Interpretation of sham feeding data: curve-shift studies
H P Weingarten1, A Duong, D Elston
1Department of Psychology, McMaster University, Hamilton, Ontario, Canada.
The American Journal of Physiology
|October 1, 1996
Summary
Quantitative analysis of sweet solution intake in rats revealed that dopamine antagonists and quinine alter taste processing. Other factors reducing intake did not affect taste processing, indicating specific mechanisms influence sweet preference.
Area of Science:
- Neuroscience
- Behavioral Science
- Physiology
Background:
- Understanding the neural and physiological mechanisms governing food intake is crucial.
- Sweet taste perception plays a significant role in regulating appetite and nutrient consumption.
- Sham feeding provides a method to study intake control independent of post-ingestive feedback.
Purpose of the Study:
- To investigate how different treatments affect the intake of sweet solutions using quantitative analysis.
- To determine if treatments altering sham intake also modify the relationship between sucrose concentration and intake.
- To differentiate treatments affecting taste input processing from those with other effects on intake.
Main Methods:
- Rats were sham fed sucrose solutions across a range of concentrations (0.03125 to 1.5 M).
- Intake concentration functions were generated by plotting sham intake against sucrose concentration.
- Key metrics included the sucrose concentration yielding 50% maximal sham intake.
Main Results:
- Quinine adulteration and pimozide (dopamine antagonist) reduced sham intake and shifted the concentration-intake function rightward.
- Lithium chloride, reduced food deprivation, and cholecystokinin octapeptide also reduced sham intake.
- These latter treatments did not shift the concentration-intake functions, indicating a different mechanism of action.
Conclusions:
- Quantitative analysis of sham feeding can distinguish between treatments that alter taste processing and those that do not.
- Dopamine pathways and taste adulteration appear to directly impact the processing of sweet taste input.
- These findings highlight the utility of concentration-intake functions in dissecting the mechanisms of appetite regulation.