Sound fields in biosphere of the mountain streams and their influence on the human EEG

Abstract

Low-frequency acoustics fields in the biosphere of the headwater regions in Poland (Bieszczady Mountains and Tatry Mountains) were researched and the the influence of observed low-frequency acoustics field on changes of human EEG signals was analyzed. Several places were found with specific distribution of sound fields where low frequencies dominated. Interesting parameters of distribution of the riverbeds and physical characterization of flows were determined. Standard EEG signal was recorded from subjects until exposure for 20 min. It was ascertained that spectra of sound-pressure levels were with specific shape, very similar for a group of rivers. The influences of SPL on level of power spectrum of EEG signal were analyzed. Changes in the brain waves were observed with increases in delta and decreases in alpha. Tested subjects reported behavior specific for relaxation.