Fig 4. Scaling exponents (β) obtained from analyzing the PSDs of IBI time series.
A. Neither the clock nor the motor process is random but clearly long-range persistent, i.e. βC > 0, −βM < 2. *** denotes p ≪ 10−3 (significance obtained by bootstrapping). B. Genre-dependence of the scaling exponents. The motor process showed significantly stronger long-range persistence in rock/pop (R) than in jazz (J). The box plot depicts the median in red, boxes at the first and third quartile, whiskers at 1.5 ⋅ IQR (interquartile range), and circles represent outliers. ** denotes p = 0.001, and n.s. denotes not significant.