Prelimbic cortex inactivation prevents ABA renewal based on satiety state

Area of Science:

• Neuroscience
• Behavioral Neuroscience
• Learning and Memory

Background:

• The prelimbic cortex (PL) is known to be essential for instrumental behavior performance based on learned contexts.
• Contexts can be physical, behavioral, or internal states like satiety.

Purpose of the Study:

• To investigate the role of the prelimbic cortex (PL) in utilizing satiety level as an interoceptive context for behavior renewal.
• To determine if the PL is necessary for context-dependent renewal of instrumental behaviors acquired during satiety.

Main Methods:

• Rats were trained to lever-press for rewards while sated and underwent extinction training while hungry.
• The PL was pharmacologically inactivated using baclofen/muscimol infusions.
• Behavioral renewal was assessed upon return to the sated context.

Main Results:

• Pharmacological inactivation of the PL significantly attenuated the renewal of lever-pressing behavior upon return to the sated context.
• Control animals receiving a vehicle infusion showed significant renewal of the extinguished response.
• This indicates the PL's involvement in using satiety as a contextual cue.

Conclusions:

• The prelimbic cortex (PL) plays a critical role in monitoring interoceptive states, such as satiety, as contextual elements for behavior.
• The PL promotes the performance of previously learned instrumental behaviors when relevant contextual cues, including internal states, are present.