Quantifying variability in phase portraits: Application to gait ontogeny

John D. Polk, Jesse Spencer-Smith, Louis DiBerardino, Daniel Ellis, Matthew Downen, Karl S. Rosengren

Research output: Contribution to journalArticlepeer-review


We describe new Fourier- and shape-based methods for quantifying variation in phase-portraits, and re-analyze previously-published ontogenetic and adult data [Clark, J. E., & Phillips, S. J. (1993). A longitudinal study of intralimb coordination in the first year of independent walking: A dynamical systems approach. Child Development, 64, 1143-1157]. Results show considerable variation between individuals and through development, but after 6 months of walking some gait patterns stabilize.

Original languageEnglish (US)
Pages (from-to)302-306
Number of pages5
JournalInfant Behavior and Development
Issue number2
StatePublished - Apr 2008


  • Development
  • Elliptical Fourier analysis
  • Gait
  • Phase portraits
  • Variability

ASJC Scopus subject areas

  • Developmental and Educational Psychology


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