When two pure tones of slightly different frequency are presented separately to each ear, the listener perceives a third single tone with amplitude variations at a frequency that equals the difference between the two tones; this perceptual illusion is known as the binaural auditory beat (BB). There are anecdotal reports that suggest that the binaural beat can entrain EEG activity and may affect the arousal levels, although few studies have been published. There is a need for double-blind, well-designed studies in order to establish a solid foundation for these sounds, as most of the documented benefits come from self-reported cases that could be affected by placebo effect. As BBs are a cheap technology (it even exists a free open source programmable binaural- beat generator on the Internet named Gnaural), any achievement in this area could be of public interest. The aim in our research was to explore the potential of BBs in a particular field: tasks that require focus and concentration. In order to detect changes in the brain waves that could relate to any particular improvement, EEG recordings of a small sample of individuals were also obtained. In this study we compare the effect of different binaural stimulation in 7 EEG frequency ranges. 78 participants were exposed to 20-min binaural beat stimulation. The effects were obtained both quali- tative with cognitive test and quantitative with EEG analysis. Results suggest no significant statistical improvement in 20-min stimulation.
2
Dostęp do pełnego tekstu na zewnętrznej witrynie WWW
W pracy omówiono metodę wywoływania zjawiska wodzenia czynności bioelektrycznej mózgu z zastosowaniem ekspozycji niskoczęstotliwościowego sygnału akustycznego oraz przedstawiono wyniki przeprowadzonych badań doświadczalnych. W badaniach eksperymentalnych zastosowano niskoczęstotliwościowe fale akustyczne o częstotliwościach f = 7, 18 i 40 Hz. Uzyskane rezultaty pozwalają postawić tezę o możliwości zastosowania niskoczęstotliwościowej fali akustycznej jako próby stroboskopowej wykonywanej w badaniach EEG.
EN
The paper describes the method of inducing the frequency following response under the low frequency acoustic waves exposure. Experimental tests with low frequency acoustic waves (f = 7, 18 and 40 Hz) were performed. Experimental results suggest that low frequency acoustics waves can be used as a stroboscope test conducted in EEG examination. Keywords: low frequency sound, EEG, stroboscope test, frequency following response
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.