A Standardized Nonvisual Behavioral Event Is Broadcasted Homogeneously across Cortical Visual Areas without...

Area of Science:

• Neuroscience
• Visual Cortex Research
• Sensory Processing

Background:

• Motor activity profoundly influences primary sensory areas, including V1.
• The precise role of motor-related activity in sensory processing remains largely undefined.
• Understanding how motor signals integrate with sensory information is crucial for cognitive function.

Purpose of the Study:

• To investigate the broadcast of motor-related signals across visual cortex layers and areas.
• To differentiate neuronal responses during spontaneous, irrelevant motor events (fidgets) from visually relevant behaviors (running).
• To elucidate the functional implications of behaviorally orthogonal signals in the visual cortex.

Main Methods:

• Utilized a large two-photon calcium imaging database of neuronal responses in passively viewing mice.
• Analyzed spontaneous behavioral fidget events, comparing them to visually relevant behaviors like running.
• Examined neural response patterns across different layers and areas of the visual cortex.

Main Results:

• Identified four consistent neural response types during fidget events across all visual areas and layers.
• Found that layer and area identity could not be decoded from neuronal recordings during fidgets.
• Demonstrated that fidget-evoked neural responses are independent of visual processing, unlike running-evoked responses.
• Observed that irrelevant motor signals project to separate local neural subspaces, distinct from behaviorally relevant motor outputs.

Conclusions:

• Spontaneous, irrelevant motor signals are broadcast uniformly across visual cortex layers and areas.
• These visually orthogonal signals may play a key role in how the cortex integrates sensory information with motor outputs.
• Irrelevant motor activity influences sensory processing through distinct neural pathways compared to relevant motor behaviors.