Risk reshapes amygdala representation of choice.

Area of Science:

• Neuroscience
• Behavioral Biology
• Computational Neuroscience

Background:

• Adaptive behavior requires modifying actions based on environmental changes, such as avoiding punishment.
• Understanding the neural basis of decision-making under risk is crucial for explaining behavioral flexibility.

Purpose of the Study:

• To investigate the neural mechanisms in the basolateral amygdala (BLA) that mediate behavioral adjustments in response to punishment risk.
• To elucidate how BLA activity patterns change during choice selection between safe and risky reward options.

Main Methods:

• In vivo cellular-resolution calcium imaging in male mice.
• Optogenetic and chemogenetic manipulation of neural activity.
• Behavioral assays measuring reward choice under punishment risk.

Main Results:

• Punishment risk significantly altered choice behavior, favoring safe over risky rewards.
• BLA neural representations were dynamically reshaped by punishment risk.
• Specific BLA neuronal ensembles were reactivated during the execution or abortion of risky choices.
• Newly encoding BLA neurons incorporated into pre-choice representations predicted avoidance of risky options.

Conclusions:

• Dynamic reshaping of choice-related BLA representations is essential for behavioral flexibility when facing risk.
• The BLA plays a causal role in integrating punishment risk into decision-making processes.
• These findings offer insights into the neural underpinnings of adaptive decision-making under uncertainty.