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Proceedings Paper

Novel multiscale regulation in human motor activity
Author(s): Kun Hu; Plamen Ch. Ivanov; Zhi Chen; Michael F. Hilton; H. Eugene Stanley; Stephen A. Shea
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Paper Abstract

Human motor activity is influenced by many factors both extrinsic (work, recreation, reactions to unforeseen random events) and intrinsic (circadian and ultradian rhythms). We investigate if these factors fully account for the complex features observed in recordings of human activity. First, we measure activity over two weeks from forearm motion in subjects undergoing their regular daily routine. We show that no systematic ultradian rhythms exist in human activity during wakefulness. Furthermore, we demonstrate that during wakefulness human activity possesses previously unrecognized dynamic patterns characterized by long-range fractal correlations and nonlinear Fourier phase interactions. These patterns are unaffected by changes in the average activity level occuring within individual subjects throughout the day, on different days, and between subjects. Second, we find that these patterns persist when the same subjects undergo time-isolation laboratory experiments designed to account for the phase of the circadian pacemaker, and to control the known extrinsic factors. We attribute these newly discovered patterns to an intrinsic multi-scale dynamic regulation of human activity that is independent of known extrinsic factors, as well as known intrinsic factors (the circadian and ultradian rhythms).

Paper Details

Date Published: 30 April 2003
PDF: 9 pages
Proc. SPIE 5110, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems, (30 April 2003); doi: 10.1117/12.497057
Show Author Affiliations
Kun Hu, Boston Univ. (United States)
Plamen Ch. Ivanov, Boston Univ. (United States)
Harvard Medical School (United States)
Zhi Chen, Boston Univ. (United States)
Michael F. Hilton, Harvard Medical School (United States)
H. Eugene Stanley, Boston Univ. (United States)
Stephen A. Shea, Harvard Medical School (United States)

Published in SPIE Proceedings Vol. 5110:
Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems
Sergey M. Bezrukov; Hans Frauenfelder; Frank Moss, Editor(s)

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