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Related Experiment Videos

Development of human precision grip. I: Basic coordination of force.

H Forssberg1, A C Eliasson, H Kinoshita

  • 1Nobel Institute for Neurophysiology, Karolinska Institute, Karolinska Hospital, Stockholm, Sweden.

Experimental Brain Research
|January 1, 1991
PubMed
Summary

Children

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Area of Science:

  • Motor control
  • Developmental psychology
  • Biomechanics

Background:

  • Fine motor skills develop throughout childhood.
  • Understanding the development of grip force control is crucial for developmental studies.

Purpose of the Study:

  • To examine the developmental changes in the coordination of grip and load forces during object manipulation in children and adults.
  • To identify age-related differences in force scaling and timing during lifting tasks.

Main Methods:

  • Continuous measurement of grip force, load force, grip force rate, and object position during repeated object lifts.
  • Comparison of force coordination patterns between different age groups, focusing on preload and loading phases.

Main Results:

  • Adults demonstrated automatized, invariant force generation with parallel increases in grip and load forces.
  • Young children (under two) showed prolonged preload phases and asynchronous force increases, with significant grip force preceding load force.
  • Older children exhibited more parallel force increases and anticipatory strategies, though mature coordination developed later.

Conclusions:

  • Force coordination during object manipulation undergoes significant developmental changes from infancy through childhood.
  • Early motor control relies more on feedback, while mature control involves anticipatory programming.
  • The development of fine motor skills is a gradual process extending beyond early childhood.

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