Evaluation of Bio-movements Using Nonlinear Dynamics

Biological movement analysis describes specific characteristics of the person’s health status, which motivates the analysis of the dynamic aspects related to the rhythms and movements of our body. Natural, free movements can be periodic or irregular in time and space, and each type of dynamic behavior can be related to efficient or altered movements. This research describes an overview of nonlinear dynamics and concepts of chaos applied to bio-motion paths as a way to describe and analyze a bio-movement, for example, the eye movement presents different rhythms depending on the demand for exploration or the state of health of the person. For this research, 20 subjects with normal vision were involved. Their eye movements and head movements were registered using an eye tracker and head-mounted tracker, measuring the position and rotation of the eye and head. The results demonstrate that nonlinear analysis can be applied to evaluate alteration in the biological system showing more sensitivity than traditional spectral analysis. This type of evaluation can provide a tool to find the relationship between movement dynamics and physiological phenomena, which might be useful to describe any alteration in the biological system.