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Habitual Behavior Is Mediated by a Shift in Response-Outcome Encoding by Infralimbic Cortex.

Jacqueline M Barker1, W Bailey Glen1, David N Linsenbardt2

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Summary

The infralimbic cortex (IfL-C) regulates switching between goal-directed actions and habits. Inhibiting IfL-C during habitual behavior restores sensitivity to action-outcome changes, revealing a mechanism for habit formation.

Keywords:
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Area of Science:

  • Neuroscience
  • Behavioral Science

Background:

  • Flexible switching between goal-directed actions and habits is vital for adaptive behavior.
  • The infralimbic prefrontal cortex (IfL-C) is a key brain region for regulating response strategies.

Purpose of the Study:

  • To investigate the specific role of the IfL-C in promoting habitual behavior.
  • To understand how the IfL-C encodes information about action-outcome relationships during goal-directed actions versus habits.

Main Methods:

  • Utilized two reinforcement schedules in mice to induce either habitual or goal-directed actions.
  • Employed optogenetic inhibition of the IfL-C during specific behavioral states.
  • Monitored encoding of behavioral outcomes in the IfL-C.

Main Results:

  • Information about action-outcome relationships is encoded in the IfL-C during goal-directed actions but this encoding is lost during habit formation.
  • Optogenetic inhibition of the IfL-C during habitual behavior (specifically during reduced firing rates in unreinforced actions) restored sensitivity to action-outcome contingency changes.

Conclusions:

  • The IfL-C plays a novel role in promoting habitual behavior by altering the encoding of action-outcome information.
  • Findings offer insights into potential therapeutic strategies for pathological inflexible behaviors seen in neuropsychiatric disorders.