![]() ![]() The synchronisation is lost after spinalisation. The sympathetic discharge and ventilation are strongly coupled and the coupling strength is not affected by manoeuvres capable of increasing or depressing sympathetic activity. The synchronisation analysis is utilised to measure the coupling strength between the beat-to-beat variability of the sympathetic discharge and ventilation in decerebrate artificially ventilated cats and the degree of synchronisation between the beat-to-beat variability of the heart period and ventricular repolarisation interval in normal subjects and myocardial infarction patients. Simulations in which non-linear coordination schemes are produced and changes in the coupling strength are artificially induced are used to check the ability of the proposed index to measure the degree of synchronisation between signals. It quantifies the maximum amount of information exchanged between the two signals. A synchronisation index is derived from the estimate of the uncoupling function by means of a minimisation procedure. An estimator of the uncoupling function able to deal with short segments of data (a few hundred samples) is proposed, thus enabling the method to be used for usual experimental recordings. the information carried by one signal which cannot be derived from the other). The method is based on the definition of an uncoupling function calculating, by means of entropy rates, the minimum amount of independent information (i.e. A method that enables measurement of the degree of coupling between two signals is presented. ![]()
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