Approximate entropy used to assess sitting postural sway of infants with developmental delay

Joan E. Deffeyes, Regina T. Harbourne, Wayne A. Stuberg, Nicholas Stergiou

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


Infant sitting postural sway provides a window into motor development at an early age. The approximate entropy, a measure of randomness, in the postural sway was used to assess developmental delay, as occurs in cerebral palsy. Parameters used for the calculation of approximate entropy were investigated, and approximate entropy of postural sway in early sitting was found to be lower for infants with developmental delay in the anterior-posterior axis, but not in the medial-lateral axis. Spectral analysis showed higher frequency features in the postural sway of early sitting of infants with typical development, suggesting a faster control mechanism is active in infants with typical development as compared to infants with delayed development, perhaps activated by near-fall events.

Original languageEnglish (US)
Pages (from-to)81-99
Number of pages19
JournalInfant Behavior and Development
Issue number1
StatePublished - Feb 2011


  • Cerebral palsy
  • Motor development
  • Postural control
  • Regularity
  • Spectral analysis

ASJC Scopus subject areas

  • Developmental and Educational Psychology


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