The scale-free nature of daily human activity has been observed in different aspects;
however, the description of its spectral characteristics is incomplete. General findings are …

Prolonged periods of sleep restriction seem to be common in the contemporary world. Sleep
loss causes perturbations of circadian rhythmicity and degradation of waking alertness as …

It has been shown that human behavior, observed as a time-series of physical activity
intensity, exhibits a temporal fractal nature (TFN) characterized by the pattern of alternating …

Both parametric and non-parametric approaches to time-series analysis have advantages
and drawbacks. Parametric methods, although powerful and widely used, can yield …

We study the statistical properties of human activities by analyzing actigraphy data that
monitor wrist movements of normal subjects and patients with bipolar II disorder. Probing the …

There is substantial evidence about the scale-independent nature of human dynamics.
Within the field of actigraphy, numerous findings support this claim, such as the emergence …

Objective This study provides an objective measure based on actigraphy for Attention Deficit
Hyperactivity Disorder (ADHD) diagnosis in children. We search for motor activity features …

This paper is an introduction to the special issue of the 7th Int. Conf. on Unsolved Problems
on Noise (UPoN) that took place at Casa Convalescència in Barcelona (Spain) in July 2015 …