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Using the Threat Probability Task to Assess Anxiety and Fear During Uncertain and Certain Threat
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Infralimbic parvalbumin neural activity facilitates cued threat avoidance.

Yi-Yun Ho1,2, Qiuwei Yang1, Priyanka Boddu1

  • 1Department of Neurobiology and Behavior, Cornell University, Ithaca, United States.

Elife
|April 1, 2025
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Summary

Infralimbic cortex (IL) parvalbumin (PV) interneurons help mice learn to avoid threats by suppressing freezing behaviors. This neural activity is crucial for strategic avoidance, not general movement.

Keywords:
avoidanceimaginginfralimbicmouseneuroscienceoptogeneticparvalbuminprefrontal cortex

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Area of Science:

  • Neuroscience
  • Behavioral Neuroscience
  • Molecular Psychiatry

Background:

  • The infralimbic cortex (IL) plays a key role in flexible behavioral responses to threats.
  • Understanding the specific roles of IL neural subtypes in avoidance behavior is crucial.
  • Parvalbumin (PV) interneurons are a distinct subtype within the IL with poorly understood functions.

Purpose of the Study:

  • To investigate the role of IL parvalbumin (PV) interneurons in active avoidance behavior.
  • To determine how PV interneuron activity relates to suppressing freezing and enabling movement to safety.

Main Methods:

  • Utilized a mouse model to study active avoidance behavior following a single shock.
  • Recorded PV interneuron activity during avoidance, reward-seeking, and general locomotion tasks.
  • Employed optogenetics to suppress PV neuron activity and assess behavioral changes.

Main Results:

  • IL PV interneuron activity increased during movement to avoid shock, emerging after initial shock exposure.
  • PV neuron activity did not change during reward-seeking or general locomotion.
  • Optogenetic suppression of PV neurons prolonged freezing and delayed avoidance onset, without affecting other movements.

Conclusions:

  • IL PV interneurons are critical for strategic avoidance behavior by actively suppressing freezing.
  • These findings elucidate a specific neural mechanism underlying threat avoidance and behavioral flexibility.