Memory beyond memory in heart beating, a sign of a healthy physiological condition.
We describe two types of memory and illustrate each using artificial and actual heartbeat data sets. The first type of memory, yielding anomalous diffusion, implies the inverse power-law nature of the waiting time distribution and the second the correlation among distinct times, and consequently also the occurrence of many pseudoevents, namely, not genuinely random events. Using the method of diffusion entropy analysis, we establish the scaling that would be determined by the real events alone. We prove that the heart beating of healthy patients reveals the existence of many more pseudoevents than in the patients with congestive heart failure.
Allegrini
P
P
Istituto di Linguistica Computazionale del Consiglio Nazionale delle Ricerche, Area della Ricerca di Pisa-S. Cataldo, Via Moruzzi 1, 56124, Ghezzano-Pisa, Italy.
Grigolini
P
P
Hamilton
P
P
Palatella
L
L
Raffaelli
G
G
D003198:Computer Simulation; D004562:Electrocardiography / Q000706:statistics & numerical data; D019277:Entropy; D006333:Heart Failure / Q000503:physiopathology; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008568:Memory / Q000502:physiology*; D015233:Models, Statistical