Effects of Dorsomedial Hypothalamic Lesions on Food Anticipation in Rats
Author Information
Author(s): Landry Glenn J., Kent Brianne A., Patton Danica F., Jaholkowski Mark, Marchant Elliott G., Mistlberger Ralph E.
Primary Institution: Simon Fraser University
Hypothesis
The DMH and fibers of passage spared by IBO lesions play a time-of-day dependent role in the expression of food anticipatory rhythms.
Conclusion
Rats can anticipate scheduled meals without the DMH, and improved anticipation at night suggests a modulatory role for the DMH in food anticipatory activity rhythms.
Supporting Evidence
- Rats with DMH lesions showed lower activity levels during feeding conditions compared to controls.
- Food anticipatory activity was present in all rats but varied in magnitude based on DMH integrity.
- Shifting mealtime to night improved food anticipation in rats with DMH lesions.
Takeaway
Rats can learn to expect food at certain times, even if part of their brain is damaged, and they get better at this when food is given at night.
Methodology
Rats received intra-DMH microinjections of IBO, and their activity and body temperature rhythms were recorded during different feeding schedules.
Potential Biases
Potential bias in lesion methods and the interpretation of behavioral data.
Limitations
The study may not account for all variables affecting food anticipation, and results may not be generalizable to other species.
Participant Demographics
Young adult male Sprague Dawley rats.
Statistical Information
P-Value
0.001
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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