Novel multiscale regulation in human motor activity

Kun Hu; Plamen Ch. Ivanov; Zhi Chen; Michael F. Hilton; H. Eugene Stanley; Stephen A. Shea

doi:10.1117/12.497057

30 April 2003 Novel multiscale regulation in human motor activity

Kun Hu, Plamen Ch. Ivanov, Zhi Chen, Michael F. Hilton, H. Eugene Stanley, Stephen A. Shea

Proceedings Volume 5110, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems; (2003) https://doi.org/10.1117/12.497057
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

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).

Citation Download Citation

Kun Hu, Plamen Ch. Ivanov, Zhi Chen, Michael F. Hilton, H. Eugene Stanley, and Stephen A. Shea "Novel multiscale regulation in human motor activity", Proc. SPIE 5110, Fluctuations and Noise in Biological, Biophysical, and Biomedical Systems, (30 April 2003); https://doi.org/10.1117/12.497057

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available