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Related Experiment Videos

Postural control during reaching in young infants: a dynamic systems approach

E Thelen1, J P Spencer

  • 1Department of Psychology, Indiana University, Bloomington 47405, USA. thelene@indiana.edu

Neuroscience and Biobehavioral Reviews
|May 22, 1998
PubMed
Summary

Infant motor development shows posture and reaching skills emerge through a dynamic interplay. Head control stabilizes the body, enabling coordinated arm movements for successful reaching in early development.

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Area of Science:

  • Developmental Psychology
  • Motor Control
  • Ecological Psychology

Background:

  • Postural stability is essential for goal-directed movements like reaching.
  • Infant motor development involves complex coordination of multiple body systems.
  • Schöner's dynamic model provides a framework for understanding coupled control levels.

Purpose of the Study:

  • To conceptualize the coordinated development of posture and reaching in infants.
  • To investigate the role of head and arm muscle coordination in early reaching.
  • To apply a dynamic systems approach to infant motor acquisition.

Main Methods:

  • Longitudinal study of four infants from 3 weeks to 1 year.
  • Analysis of muscle activity patterns during reaching tasks.

Related Experiment Videos

  • Application of Schöner's dynamic model of coupled levels of control.

    • Main Results:

    • Stable head control precedes reaching onset by several weeks.
    • Reaching onset involves muscle pattern reorganization for head and shoulder stabilization.
    • Coordination of head, upper, and lower arm activity is critical for successful reaching.

    Conclusions:

    • Infant motor development prioritizes postural stability alongside reaching goals.
    • Muscle pattern selection is influenced by individual factors like body size and energy.
    • Motor development is a continuous interaction between the nervous system, body, and environment.