Microchaos in human postural balance: Sensory dead zones and sampled time-delayed feedback.

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ID: 30119
2018
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Abstract
Models for the stabilization of an inverted pendulum figure prominently in studies of human balance control. Surprisingly, fluctuations in measures related to the vertical displacement angle for quietly standing adults with eyes closed exhibit chaos. Here we show that small-amplitude chaotic fluctuations ("microchaos") can be generated by the interplay between three essential components of human neural balance control, namely time-delayed feedback, a sensory dead zone, and frequency-dependent encoding of force. When the sampling frequency of the force encoding is decreased, the sensitivity of the balance control to changes in the initial conditions increases. The sampled, time-delayed nature of the balance control may provide insights into why falls are more common in the very young and the elderly.
Reference Key
milton2018microchaosphysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Milton, John G;Insperger, Tamas;Cook, Walter;Harris, David Money;Stepan, Gabor;
Journal physical review e
Year 2018
DOI
10.1103/PhysRevE.98.022223
URL
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