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A Structured Rehabilitation Protocol for Improved Multifunctional Prosthetic Control: A Case Study
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Choosing between alternative wrist postures: action planning needs perception.

H C Dijkerman1, R D McIntosh, I Schindler

  • 1Department of Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands. c.dijkerman@uu.nl

Neuropsychologia
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Summary
This summary is machine-generated.

Visual agnosia patients struggle with planning grasp posture, unlike healthy individuals. This suggests visual processing is crucial for judging movement awkwardness during object grasping.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Human Motor Control

Background:

  • Grasping objects requires planning grip orientation before movement initiation.
  • Healthy individuals exhibit consistent hand orientation adjustments based on object orientation.
  • Visual agnosia disrupts object recognition, potentially impacting motor planning.

Purpose of the Study:

  • To investigate the role of visual perception in planning grasp posture.
  • To compare grasping performance in visual agnosic patients versus healthy controls.
  • To determine if ventral stream processing is essential for adaptive grasping.

Main Methods:

  • Subjects (2 visual agnosic patients, 5 healthy controls) grasped a triangular block at various orientations (80-140 degrees).
  • Hand orientation and grasp posture (clockwise/anti-clockwise) were recorded.
  • Analysis focused on the relationship between object orientation and pre-contact hand orientation.

Main Results:

  • Healthy subjects showed predictable hand orientation and a clear switch in grasp posture around 100-110 degrees.
  • Visual agnosic patients maintained a reliable hand orientation relative to the object.
  • However, agnosic patients displayed abnormal grasp posture selection, lacking a consistent or sharply defined switch point.

Conclusions:

  • Grasp planning relies on perceptually informed judgments of movement efficiency.
  • Disruption of ventral stream visual processing, as seen in visual agnosia, impairs this planning ability.
  • This highlights the critical link between visual perception and skilled motor actions like grasping.