... of regularity, approximate entropy (APEN) and a measure of chaos, the largest Lyapunov exponent (LLE), with pre- and posttreatment lung volume time series (256 s long sampled at 4 Hz). Our results show that paroxetine significantly decreases some of the linear measures of variability and supine APEN...

... Nonlinear Anxiety Approximate entropy Biological Psychiatry Main Editor: J. Mendlewicz (Brussels) Original Paper Neuropsychobiology 2002;46:111 120 DOI: 10.1159/000066388 Nonlinear Measures of Respiration: Respiratory Irregularity and Increased Chaos of Respiration in Patients with Panic Disorder...