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Efficiently Recording the Eye-Hand Coordination to Incoordination Spectrum
07:30

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Published on: March 21, 2019

Coordination of hand shape.

Colin Pesyna1, Krishna Pundi, Martha Flanders

  • 1Department of Neuroscience, University of Minnesota, Minneapolis, Minnesota 55455, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 11, 2011
PubMed
Summary
This summary is machine-generated.

The brain coordinates hand shape perception using an object-based system. Grasping force doesn't alter shape sense, but forearm orientation significantly influences how we perceive hand shape.

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Area of Science:

  • Neuroscience
  • Somatosensory System
  • Motor Control

Background:

  • Neural control of hand movement integrates sensory, motor, and memory systems.
  • Motor coordinates for hand shape are documented, but somatosensory activity patterns are less understood.
  • Investigating somatosensory perception of hand shape is crucial for understanding neural control.

Purpose of the Study:

  • To characterize the sense of hand shape by evaluating the influence of grasping force and forearm orientation.
  • To explore the coordination between somatosensory and motor information in hand shape perception.
  • To determine if hand shape perception is invariant to grasp forcefulness but sensitive to spatial orientation.

Main Methods:

  • Human subjects reported perceived hand shapes using their left hand while interacting with objects using their right hand.
  • Experiments involved touching, supporting, or imagining holding objects with varying forces and forearm orientations.
  • Hand joint angles were measured using wired gloves to analyze motor adjustments.

Main Results:

  • Grasping or twisting forces did not significantly influence the perceptual report of hand shape.
  • Forearm orientation consistently distorted the perceived hand shape for most objects.
  • Subjects adjusted hand posture and wrist position to maintain spatial orientation of the imagined object.

Conclusions:

  • Somatosensory and motor information are coordinated in an object-based, spatial-coordinate system for hand shape perception.
  • Perception of hand shape is sensitive to orientation relative to gravity but invariant to grasp forcefulness.
  • This suggests a sophisticated neural mechanism for integrating sensory feedback and motor commands in a spatially organized manner.