DFA as a window into postural dynamics supporting task performance : Does choice of step size matter?
Introduction: Detrended Fluctuation Analysis (DFA) has been used to investigate self-similarity in center of pressure (CoP) time series. For fractional gaussian noise (fGn) signals, the analysis returns a scaling exponent, DFA-α, whose value characterizes the temporal correlations as persistent, random, or anti- persistent. In the study of postural control, DFA has revealed two time scaling region