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Updated: Jan 24, 2026

Frame-by-Frame Video Analysis of Idiosyncratic Reach-to-Grasp Movements in Humans
Published on: January 15, 2018
Effect of Stroke on Joint Control during Reach-to-Grasp: A Preliminary Study
Sandesh Raj1, Natalia Dounskaia2, William W Clark3
1Department of Occupational Therapy, University of Pittsburgh, Pittsburgh, Pennsylvania, USA.
Stroke survivors with upper extremity dyscoordination actively suppress interaction torque during reach-to-grasp movements. This leads to inefficient control and worsens with stroke severity, potentially compensating for impaired feedforward control.
Area of Science:
- Neuroscience
- Biomechanics
- Rehabilitation Science
Background:
- Stroke frequently causes upper extremity dyscoordination.
- Understanding the neural control of movement post-stroke is crucial for rehabilitation.
Purpose of the Study:
- To investigate altered inter-segmental dynamics control in stroke-induced upper extremity dyscoordination.
- To examine the role of interaction torque in movement inefficiency after stroke.
Main Methods:
- Kinetic analysis of natural reach-to-grasp movements.
- Comparison between individuals with stroke and healthy controls.
Main Results:
- Individuals with stroke actively suppressed interaction torque at the elbow more than healthy individuals.
- This suppression resulted in inefficient active control and upper extremity dyscoordination.
- Suppression severity and control inefficiency positively correlated with stroke severity.
Conclusions:
- Stroke survivors may suppress interaction torque to compensate for impaired feedforward control.
- Altered inter-segmental dynamics contribute significantly to post-stroke motor deficits.
- Findings inform targeted rehabilitation strategies for upper extremity function.
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Published on: February 7, 2025
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