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Related Experiment Videos

How normal is variable, or how variable is normal?

B C Touwen1

  • 1Department of Developmental Neurology, University Hospital, Groningen, Netherlands.

Early Human Development
|September 1, 1993
PubMed
Summary
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Central nervous system variability changes throughout childhood. Infancy shows primary variability in sensomotor skills, while toddlerhood develops adaptive variability crucial for motor skill development.

Area of Science:

  • Neuroscience
  • Developmental Psychology
  • Motor Control

Background:

  • Variability is a key characteristic of the central nervous system.
  • This variability undergoes significant changes from infancy through childhood.
  • Understanding these changes is crucial for assessing typical development.

Purpose of the Study:

  • To describe the developmental trajectory of variability in the central nervous system.
  • To differentiate between primary and adaptive variability.
  • To establish a framework for interpreting variability in childhood development.

Main Methods:

  • Observational analysis of sensomotor function performance.
  • Characterization of variability types based on developmental stages (infancy, toddlerhood, preschool, school age).

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  • Qualitative assessment of variability's role in motor skill acquisition.

    • Main Results:

    • Infancy is characterized by indiscriminate or primary variability in sensomotor functions.
    • Toddlerhood marks the emergence of secondary or adaptive variability, involving selection and automatization of variations.
    • Adaptive variability is essential for developing advanced motor skills in later childhood.

    Conclusions:

    • Variability in the central nervous system is not a static measure but a dynamic developmental process.
    • Primary variability in infancy transitions to adaptive variability, supporting motor skill refinement.
    • The concept of 'normal variability' must consider its extent, type, and age-appropriateness for accurate interpretation.