Rule-based modulation of a sensorimotor transformation across cortical areas

Area of Science:

• Neuroscience
• Cognitive Neuroscience
• Behavioral Neuroscience

Background:

• Adapting to dynamic environments requires flexible behavioral responses to sensory stimuli guided by changing rules.
• The neural mechanisms underlying the encoding and utilization of rule information for behavior remain incompletely understood.

Purpose of the Study:

• To investigate how the brain encodes and uses rule information to guide flexible action selection in a cross-modal sensory task.
• To determine if preparatory neural states in sensorimotor cortical areas shape sensory processing and behavior based on task rules.

Main Methods:

• Single-unit recordings were performed in head-fixed mice executing a cross-modal sensory selection task with switching rules.
• Neural activity was analyzed in somatosensory (S1, S2) and motor (MM, ALM) cortical areas.
• Optogenetic disruption was used to assess the causal role of pre-stimulus neural states.

Main Results:

• Single-neuron activity in sensorimotor areas distinguished between task rules before and during stimulus presentation.
• Pre-stimulus population activity in motor cortical areas (MM, ALM) allowed decoding of the current task rule.
• Distinct neural subspaces characterized population activity for each rule, and disrupting these states impaired performance.

Conclusions:

• Motor cortical areas (MM, ALM) exhibit rule-dependent preparatory states that shape sensory processing and behavior.
• Flexible action selection is achieved through the configuration of these preparatory states in the motor cortex.
• These findings elucidate a neural mechanism for adaptive behavior in complex, dynamic environments.