Quantifying variability in phase portraits: application to gait ontogeny |
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| Authors: | Polk John D Spencer-Smith Jesse DiBerardino Louis Ellis Daniel Downen Matthew Rosengren Karl S |
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| Affiliation: | aDepartment of Anthropology, University of Illinois Urbana-Champaign, 109 Davenport Hall, 607 South Mathews Avenue, Urbana, IL, 61801, United States;bDepartment of Psychology, University of Illinois Urbana-Champaign, United States;cDepartment of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, United States;dDepartment of Kinesiology and Community Health, University of Illinois Urbana-Champaign, United States |
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| Abstract: | 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. |
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| Keywords: | Phase portraits Variability Development Elliptical Fourier analysis Gait |
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