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Parkinsonian tremor is one of the primary symptoms of Parkinson's disease. The current methods of objective assessment are mainly based on amplitude and frequency. In recent years, the ApEn and Cross-ApEn have been introduced as new methods of nonlinear analysis. They are used to assess the regularity and synchrony of time series. In this paper, a set of wireless data acquisition units were developed...
A feature of time-series variability that may reveal underlying complex dynamics is the degree of "convolutedness". For multivariate series of m components, convolutedness can be defined as the propensity of the trail of the time-series samples to fill the m-dimensional space. This work proposes different convolutedness indices and compare them on synthesized and real physiological signals...
Mental stress has been an issue in modern society. Several studies have investigated the detection of mental stress using physiological indices. However, measurement of these indices would itself impart a certain level of stress to subjects. The temporal dynamics of key typing are called “keystroke dynamics”. Keystroke dynamics show variations with psychological subtlety. The objective of this study...
Heart rate asymmetry (HRA) is considered as a physiological phenomenon seen in heart rates of healthy subjects. In this article, we propose a novel heart rate asymmetry index and assess the discriminative power of proposed index in comparison with conventional heart rate asymmetry indices. As an illustrative example we discriminate patients suffering from congestive heart failure (CHF) from a healthy...
Phytoplankton pigment composition has been studied during two years at station located in the subtropical North Atlantic Ocean, in a station for time series in the ocean. The concentration and proportion of several diagnostic pigments is used for the determination of phytoplankton communities present in the area, and consequently their seasonal and temporal variability. The knowledge of phytoplankton...
Introduction: Time irreversibility is a characteristic feature of non-equilibrium, complex systems including cardiovascular control mediated by the autonomic nervous system. Its analysis in heart rate variability (HRV) signal represents a new approach to assess cardiovascular regulatory mechanisms.
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