Prelimbic cortex inactivation prevents ABA renewal based on stress state.

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Our recent research suggests that the interoceptive state associated with stress can function as a contextual stimulus for operant behavior. In the present experiment, we investigated the role of the rodent prelimbic cortex (PL), a brain region that is critical in contextual control of operant behavior, in the ability of a stressed state to produce ABA renewal of an extinguished operant response. Rats were trained to perform a lever press response for a food pellet reward during daily sessions that followed exposure to a stressor that changed each day. The response was then extinguished in the absence of stress. ABA renewal of extinguished responding occurred following exposure to another stressor (different from any used during acquisition) in control rats but not in rats that received a PL-inactivating infusion (baclofen/muscimol). Results confirm that the interoceptive state of stress can play the role of a contextual stimulus and initiate renewal (relapse) of an inhibited behavior when stress has previously been associated with the behavior. In conjunction with our previous work, the present results support the hypothesis that the PL is important for contexts, both exteroceptive and interoceptive, to exert such control over operant behavior. (PsycInfo Database Record (c) 2023 APA, all rights reserved).

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