ANALYSIS OF EFFECT OF SOUND LEVELS ON EEG

This paper describes the effects of various levels of sound on brain using Electroencephalogram (EEG). In this study music (a form of sound) has been considered and analyzed. International 10-20 System has been used to get 19 channels of EEG signal. Consequently, the brainwave's signal has analyzed and the comparison between these different sound levels is discussed. This experiment focused mainly on two types of brain waves which are alpha (8-12 Hz) and beta wave (13-30 Hz). The analysis is carried out using Power Spectral Analysis method. Alpha wave is important as stress indicator meanwhile beta wave is associated with fast brain activity or disturbed situation of brain. High power of alpha waves and low power of beta waves that obtained during low levels of sound indicate that subjects were in relaxed state. However, when subjects exposed to 100db, beta waves power increased indicating subjects in disturbed state. Meanwhile, the decrease of alpha wave magnitude showed that subjects in tense.