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Divisively Normalized Integration of Multisensory Error Information Develops Motor Memories Specific to Vision and

Takuji Hayashi1,2,3, Yutaro Kato4, Daichi Nozaki5

  • 1Graduate School of Engineering, Tokyo University of Agriculture and Technology, Tokyo 184-8588, Japan, thayashi423@gmail.com nozaki@p.u-tokyo.ac.jp.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|January 12, 2020
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This study reveals that motor adaptation integrates visual and proprioceptive signals using divisive normalization. This suggests separate motor memories for each sense are combined during movement execution, not initial processing.

Keywords:
divisive normalizationmotor learningmultisensory integrationreaching movement

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Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Integration

Background:

  • Accurate limb movement relies on both visual and proprioceptive input.
  • The precise mechanism for integrating these sensory signals in motor control and learning is not fully understood and remains debated.

Purpose of the Study:

  • To investigate the mechanism of multisensory integration during motor adaptation.
  • To evaluate how visual and proprioceptive perturbations influence motor learning and aftereffects.

Main Methods:

  • Utilized the force-channel method to apply controlled visual and proprioceptive perturbations during reaching movements.
  • Quantified lateral force as aftereffects in probe trials to analyze motor system corrections.
  • Tested conditions where visual and proprioceptive perturbations opposed each other.

Main Results:

  • Observed complex dependencies between aftereffects and the magnitude/direction of sensory errors.
  • Found that divisive normalization, a known neural computation, reasonably explains the observed adaptation patterns.
  • Demonstrated that motor memories for visual and proprioceptive information develop separately and are integrated at the motor execution level.

Conclusions:

  • Multisensory integration in motor learning can be explained by divisive normalization.
  • Motor adaptation involves separate development of sensory-specific motor memories, followed by integration during movement execution.
  • Presents a novel framework for understanding how the brain utilizes and integrates multimodal sensory information for precise limb movements.