Related Experiment Videos
Relationship of proximal and distal function in motor development
Insights
Motor development may not follow a strict proximo-distal sequence. This study found no significant link between proximal and distal motor skills in infants, suggesting separate developmental pathways.
Area of Science:
- Developmental Psychology
- Motor Control
- Pediatrics
Background:
- The traditional proximo-distal principle suggests distal motor skills develop from and depend on proximal control.
- This principle is widely applied in assessing and treating motor system dysfunction in infants.
Purpose of the Study:
- To investigate the relationship between proximal and distal motor function in 30-week-old infants.
- To challenge the established proximo-distal model of motor development.
Main Methods:
- 12 healthy 30-week-old infants (9 girls, 3 boys) participated.
- Infants were videotaped while reaching for a cube in a form board.
- Proximal (visually guided reaching) and distal (prehensile) skills were rated using nonstandardized scales.
Main Results:
- No significant linear relationship was observed between proximal and distal motor behaviors.
- Infant motor development did not demonstrate a clear dependency of distal skills on proximal control.
Conclusions:
- Distal motor development does not necessarily follow proximal motor development.
- Separate motor control systems for proximal and distal functions are possible.
- Current proximo-distal sequences in treating motor dysfunction may require reconsideration.
Abstract:
This study questions the validity of the principle of a proximo-distal direction of motor development and the idea that distal skill emerges out of and is dependent upon proximal control. To determine the relationship between proximal and distal motor function, 12 normal infants (9 girls, 3 boys), 30-weeks of age, were recorded on videotape while reaching for a one-inch red cube contained in a specially designed form board. Their visually guided reaching (proximal) ability and prehensile (distal) skills were rated on nonstandardized scales. No significant linear relationship was found between proximal and distal motor behavior. The conclusion that distal development does not necessarily follow proximal motor development is offered. The possibility that two different motor-control systems governin; proximal and distal function is considered. Reconsideration of the proximo-distal sequences currently used in treating motor-system dysfunction is recommended.