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Rats were trained to press a lever under a 'Multiple FI-60s and Extinction' schedule with food reinforcements. After learning the task, an in vivo microdialysis probe was inserted into the dentate gyrus and CA3 regions of the hippocampus, and the sequential changes in the dialysate acetylcholine (ACh) concentration were analyzed. In the session, two fixed-interval of reinforcement (FI) components...
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