We study the possibility to synchronize cardiorhythm of a human by periodic and aperiodic sequences of light and sound pulses. Aperiodic forcing is defined by variation of RR intervals of another subject. Phase locking between cardiorhythm and weak external forcing is detected on finite time intervals. We observe the 1:1 synchronization for periodic forcing and n:m synchronization for aperiodic one.
Anishchenko, V. S., Balanov, A. G., Janson, N. B., Igosheva, N. B., & Bordyugov, G. V. (2000). Synchronization of cardiorhythm by weak external forcing. Discrete Dynamics in Nature and Society, 4(3), 201–206. https://doi.org/10.1155/s1026022600000194