Source Paper
Involvement of the Prelimbic–Infralimbic Areas of the Rodent Prefrontal Cortex in Behavioral Flexibility for Place and Response Learning
Michael E. Ragozzino, Shauna Detrick, Raymond P. Kesner
Journal of Neuroscience • 1999
View Abstract
The present experiments investigated the role of the prelimbic–infralimbic areas in behavioral flexibility using a place–response learning paradigm. All rats received a bilateral cannula implant aimed at the prelimbic–infralimbic areas. To examine the role of the prelimbic–infralimbic areas in shifting strategies, rats were tested on a place and a response discrimination in a cross-maze. Some rats were tested on the place version first followed by the response version. The procedure for the other rats was reversed. Infusions of 2% tetracaine into the prelimbic–infralimbic areas did not impair acquisition of the place or response discriminations. Prelimbic–infralimbic inactivation did impair learning when rats were switched from one discrimination to the other (cross-modal shift). To investigate the role of the prelimbic–infralimbic areas in intramodal shifts (reversal learning), one group of rats was tested on a place reversal and another group tested on a response reversal. Prelimbic–infralimbic inactivation did not impair place or response intramodal shifts. Some rats that completed testing on a particular version in the cross-modal and intramodal experiments were tested on the same version in a new room for 3 d. The transfer tests revealed that rats use a spatial strategy on the place version and an egocentric response strategy on the response version. Overall, these results suggest that the prelimbic–infralimbic areas are important for behavioral flexibility involving cross-modal but not intramodal shifts.
Transfer Test
Objective: To determine whether rats use spatial or egocentric response strategies by testing them on the same discrimination version in a new room for 3 days
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Protocol Steps
Select rats for transfer testing
Select some rats that completed testing on a particular version in the cross-modal and intramodal experiments
Note: Rats must have completed either place or response discrimination testing in previous experiments
View evidence from paper
“Some rats that completed testing on a particular version in the cross-modal and intramodal experiments were tested on the same version in a new room for 3 d”
Transfer test in new room
Test rats on the same discrimination version (either place or response) in a new room
Note: The new room environment differs from the original testing location to assess strategy use
View evidence from paper
“tested on the same version in a new room for 3 d”
Assess strategy type
Analyze performance to determine whether rats use spatial strategy on place version or egocentric response strategy on response version
Note: Transfer test results reveal the underlying strategy used by rats
View evidence from paper
“The transfer tests revealed that rats use a spatial strategy on the place version and an egocentric response strategy on the response version”