Dynamic gating of perceptual flexibility by non-classically responsive cortical neurons

Area of Science:

• Neuroscience
• Auditory Cortex Research
• Behavioral Plasticity

Background:

• Adaptive auditory behavior requires flexible responses to sensory cues in dynamic environments.
• Auditory cortical circuits exhibit diverse spiking responses, including reliable and irregular patterns.
• The role of irregular spiking 'non-classically responsive' neurons in behavior is underexplored.

Purpose of the Study:

• Investigate the contribution of heterogeneous neural responses in the auditory cortex to flexible auditory behavior.
• Determine the role of non-classically responsive neurons and top-down inputs in auditory learning and adaptation.

Main Methods:

• Studied auditory cortical circuits and their interactions with secondary motor cortex.
• Utilized population-level decoding to analyze neural ensemble activity during learning.
• Employed optogenetic silencing to investigate the causal role of top-down inputs.

Main Results:

• Non-classically responsive neurons were preferentially recruited during rapid learning phases.
• Mixed neural ensembles (classically and non-classically responsive) encoded more task information than homogenous ensembles.
• Silencing secondary motor cortex inputs impaired reversal learning and stimulus-reward remapping.

Conclusions:

• Flexible auditory behavior emerges from interactions between local auditory cortical circuits and top-down inputs.
• Non-classically responsive neurons, orchestrated by top-down inputs, form critical functional units for learning and behavioral flexibility.
• These findings highlight the importance of previously underexplored neural populations in adaptive sensory processing.