Quantifying variability in phase portraits: application to gait ontogeny.
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.
Department of Anthropology, University of Illinois Urbana-Champaign, 109 Davenport Hall, 607 South Mathews Avenue, Urbana, IL, 61801, United States. jdpolk@uiuc.edu
John D
JD
Polk
Jesse
J
Spencer-Smith
Louis
L
DiBerardino
Daniel
D
Ellis
Matthew
M
Downen
Karl S
KS
Rosengren
D000328:Adult; D001696:Biomechanical Phenomena / Q000379:methods*; D005684:Gait / Q000502:physiology*; D006801:Humans; D007223:Infant; D008137:Longitudinal Studies; D016138:Walking / Q000502:physiology