Naslov
How do sound rhythms affect heartbeat: Comparison of linear and non-linear analyses of R-R intervals

Autori
Valerjev, Pavle ; Šimić, Nataša

Izvornik
Review of psychology (1330-6812) 11 (2004), 1-2; 3-10

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Non-linear analyses ; Chaos ; Sound rhythms ; Heartbeat variability ; Lyapunov exponent

Sažetak
A 2x3 within groups experiment experiment with two levels of sound intensity and three levels of tempo of sound rhythm was conducted. Eleven psychology students participated in the study. SMI index, 1/f spectra slopes and some non-linear parameters - correlation dimension and largest Lypunov exponents - were used. Decrease in SMI indexes in low and medium spectral bands occurred with more intensive sound rhythms as a function of rhythm tempo increase which may point to increased stress and mental load. Spectral analysis showed no clear interference between sound and cardiac rhythm. Changes in 1/f spectra slopes were similar to those of SMI indexes. A decrease in correlation dimension for more intensive rhythms points to decrease of series dimensionality, which is probably the result of domination of non-linear factors determining dynamic system. More evidence for such an interpretation was indicated by decrease in system predictability when exposed to sound rhythms, as shown by an increase in Lyapunov exponents.

Izvorni jezik
Engleski

Znanstvena područja
Psihologija

POVEZANOST RADA