Task rule and choice are reflected by layer-specific processing in rodent auditory cortical microcircuits.

Area of Science:

• Neuroscience
• Auditory Neuroscience
• Decision Neuroscience

Background:

• The primary auditory cortex (A1) is vital for processing sound, but its role in decision-making and the underlying microcircuitry remain unclear.
• Understanding how A1 integrates sensory information with behavioral relevance is crucial for explaining auditory-guided choices.

Purpose of the Study:

• To investigate layer-specific synaptic population activity in the primary auditory cortex during auditory decision-making.
• To elucidate how the cortical microcircuitry of A1 represents task-related information and guides behavior.

Main Methods:

• Chronic, laminar current source density analysis in Mongolian gerbils trained on an auditory Go/NoGo shuttle-box task.
• Statistical modeling using generalized linear-mixed effect models to analyze neural representations.

Main Results:

• The primary auditory cortex (A1) encodes not only sensory but also task- and choice-related information.
• A layer-specific and multiplexed representation of task rules, action selection, and accumulating evidence was identified in A1.
• Neural activity in A1 reflects the preparation of correct choices based on behavioral options.

Conclusions:

• Individual cortical layers within A1 contribute distinctively to an integrative circuit for processing task-relevant information.
• These findings enhance our understanding of how the primary auditory cortex guides sensory-based decision-making.