Joint-Position Sense Accuracy Is Equally Affected by Vision among Children with and without Cerebral Palsy
Flávia de Andrade E Souza Mazuchi1, Luis Mochizuki2, Joseph Hamill3
1Biomechanics Laboratory, Sao Judas Tadeu University, Sao Paulo, Brazil.
Insights
Visual feedback significantly improves position sense accuracy in children with diplegic cerebral palsy and typically developing children. Occluding vision impaired accuracy similarly in both groups, highlighting the importance of sight for proprioception.
Area of Science:
- Neuroscience
- Developmental Psychology
- Rehabilitation Science
Background:
- Proprioception, or the sense of limb position, is crucial for motor control.
- Children with diplegic cerebral palsy often exhibit impaired motor function, including potential deficits in proprioception.
- The role of visual feedback in modulating proprioceptive accuracy in this population is not fully understood.
Purpose of the Study:
- To compare the effect of visual feedback on the upper limb position sense in children with diplegic cerebral palsy and typically developing children.
- To investigate whether visual occlusion differentially impacts proprioceptive accuracy and precision in these two groups.
Main Methods:
- An isokinetic dynamometer was used to passively move the dominant forearm in elbow flexion/extension.
- Participants (10 with diplegic cerebral palsy, 10 typically developing) indicated when a target angle was reached.
- The task was performed with and without visual feedback of the elbow angle, measuring absolute and relative position errors.
Main Results:
- Both groups showed significantly higher absolute position errors when visual feedback was occluded, indicating reduced accuracy.
- Relative position error was not significantly affected by visual feedback or by the presence of cerebral palsy.
- Visual occlusion impaired accuracy similarly in both children with diplegic cerebral palsy and typically developing children, while precision remained undisturbed.
Conclusions:
- Visual information plays a critical role in enhancing the accuracy of upper limb position sense for both children with diplegic cerebral palsy and typically developing children.
- While accuracy is compromised without vision, the precision of position sense is maintained in both groups.
- These findings suggest that interventions aimed at improving motor control in children with diplegic cerebral palsy could benefit from incorporating visual feedback strategies.
Abstract:
We compared the effect of visual information on the dominant upper limb position sense of children with diplegic cerebral palsy (n = 10) and normally developing children (n = 10). An isokinetic dynamometer passively moved the dominant forearm in 120° of elbow flexion/extension until the volunteers stopped the machine to indicate that the elbow joint was positioned in the predetermined target angle. Participants performed this task five times in sequence with and without visual feedback of the elbow angle. We calculated the absolute and the relative position errors related to the final elbow position and the target angle. In both groups, absolute error was significantly higher when vision was occluded. Relative error was not affected by cerebral palsy or visual feedback. When vision was occluded, accuracy on this task was similarly impaired in both groups and precision was not disturbed.
