Related Experiment Videos
Functional differences between the prelimbic and anterior cingulate regions of the rat prefrontal cortex
J K Seamans1, S B Floresco, A G Phillips
1Department of Psychology, University of British Columbia, Vancouver, Canada. seamans@unixg.ubc.ca
Behavioral Neuroscience
|December 1, 1995
Summary
Researchers explored how damaging parts of the rat medial prefrontal cortex (mPFC) affects foraging. Prelimbic cortex lesions impaired using new information, while anterior cingulate cortex lesions hindered behavioral flexibility.
Area of Science:
- Neuroscience
- Cognitive Psychology
Background:
- The medial prefrontal cortex (mPFC) is crucial for complex cognitive functions.
- Understanding the specific roles of its subregions, like the prelimbic (PL) and anterior cingulate (AC) cortices, is vital for elucidating decision-making processes.
Purpose of the Study:
- To investigate the distinct contributions of the rat PL and AC cortices to cognitively demanding foraging behaviors.
- To differentiate the roles of mPFC subregions in utilizing recent information versus adapting to changing strategies.
Main Methods:
- Reversible lidocaine-induced lesions were applied to the PL and AC cortices in rats.
- Performance was assessed using delayed-foraging and single-trial foraging tasks on a radial-arm maze.
Main Results:
- PL lesions disrupted foraging by causing random arm selection, indicating impaired use of recent information.
- AC lesions led to preferential revisiting of baited arms, suggesting deficits in response flexibility.
- AC-lesioned rats were impaired on a single-trial task, while well-trained PL-lesioned rats were not.
- PL-lesioned rats failed to adapt foraging strategy when switched to a single-trial task.
Conclusions:
- The rat mPFC exhibits functional heterogeneity, with distinct roles for the PL and AC cortices.
- The PL cortex is involved in organizing and modifying foraging behavior using recently acquired information.
- The AC cortex plays a significant role in maintaining response flexibility and adapting to new task demands.