Predictive Sensing: The Role of Motor Signals in Sensory Processing

Area of Science:

• Neuroscience
• Sensory Processing
• Motor Control

Background:

• Voluntary behavior requires integrating motor commands with sensory feedback.
• Distinguishing self-generated (reafferent) from external (exafferent) sensory input is crucial for perception and action.
• Understanding the neural mechanisms underlying this sensory gating is a key challenge in neuroscience.

Purpose of the Study:

• To review recent experimental findings providing circuit-level insights into how motor signals cancel reafferent sensory input during active behaviors.
• To explore common and divergent strategies across different sensory systems.
• To highlight the implications for brain flexibility and the sense of agency.

Main Methods:

• Review of recent experimental studies investigating neural circuits involved in sensory gating.
• Analysis of findings from somatosensory, vestibular, auditory, and visual systems.
• Focus on circuit-level mechanisms and the role of motor-related inputs.

Main Results:

• Sensory reafference suppression occurs at early central processing stages in somatosensory, vestibular, and auditory systems, involving the cerebellum.
• Motor-related inputs also suppress reafference at higher cortical levels, particularly in the visual system.
• Common and distinct strategies for sensory gating exist across different sensory modalities.

Conclusions:

• The brain employs sophisticated neural strategies to selectively cancel self-generated sensory input during voluntary actions.
• These mechanisms are essential for maintaining perceptual stability and accurate motor control.
• Understanding these processes provides insight into neural computations underlying agency and the calibration of sensory-motor relationships.