Impact of Subthalamic Nucleus Lesions on Food Reward Performance in Rats
Author Information
Author(s): Bezzina G., Boon F.S. den, Hampson C.L., Cheung T.H.C., Body S., Bradshaw C.M., Szabadi E., Anderson I.M., Deakin J.F.W.
Primary Institution: University of Nottingham
Hypothesis
Does destruction of the subthalamic nucleus enhance the incentive value of food rewards?
Conclusion
Destruction of the subthalamic nucleus impairs response capacity while enhancing the incentive value of food reinforcers.
Supporting Evidence
- Rats with STN lesions showed lower overall response rates compared to sham-lesioned rats.
- The motivational parameter was higher in STN-lesioned rats, indicating enhanced reinforcer value.
- Both groups' performance conformed to the model of progressive-ratio schedule performance.
- Lesions resulted in significant neuronal loss in the STN compared to sham-lesioned rats.
- Response time was significantly higher in the STN-lesioned group, indicating impaired motor performance.
Takeaway
When scientists damaged a part of the brain in rats, the rats worked harder for food, even though they didn't respond as quickly.
Methodology
Rats with lesions in the subthalamic nucleus were trained to press a lever for food under a progressive-ratio schedule, and their performance was analyzed using a mathematical model.
Potential Biases
Potential bias in the interpretation of results due to the specific focus on food rewards.
Limitations
The study's findings may not generalize to other types of reinforcers beyond food.
Participant Demographics
Thirty female Wistar rats, approximately 4 months old.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
Want to read the original?
Access the complete publication on the publisher's website