Prefrontal transthalamic uncertainty processing drives flexible switching.

Area of Science:

• Neuroscience
• Cognitive Science
• Decision-Making Research

Background:

• Adaptive decision-making in complex environments necessitates accurate error source identification.
• The frontal cortex is crucial for adaptive decisions but exhibits mixed selectivity, complicating error attribution.
• Understanding how the brain attributes errors to specific causes is a key challenge in neuroscience.

Purpose of the Study:

• To investigate how the brain attributes errors to their most likely causes during complex decision-making.
• To explore the role of the mediodorsal thalamus in representing uncertainty and facilitating adaptive behavioral adjustments.
• To elucidate the neural pathways involved in error monitoring and prefrontal cortex reconfiguration.

Main Methods:

• Neural recordings were conducted in tree shrews (Tupaia belangeri) performing a hierarchical decision task with rule reversals.
• Analysis focused on the representation of cueing and rule uncertainty in neural populations.
• Mechanistic dissection of behavioral switching was employed to identify critical neural pathways.

Main Results:

• The mediodorsal thalamus independently represents cueing and rule uncertainty.
• This thalamic representation enables prefrontal cortex reconfiguration by attributing errors to environmental changes.
• A transthalamic pathway for cingulate cortical error monitoring was identified, facilitating prefrontal executive control adjustments.

Conclusions:

• The mediodorsal thalamus plays a critical role in demixing complex cortical signals.
• The thalamus provides a low-dimensional pathway for cortico-cortical communication essential for adaptive decision-making.
• This study highlights a novel thalamic mechanism for error attribution and behavioral adaptation.