2020 Volume 32 Issue 2 Pages 663-667
Miniaturization of recording devices for electroencephalogram (EEG) is important to develop wearable EEG devices. In recent years, low-cost wearable devices for EEG monitoring have been developed and are commercially available. Daily health management and early detection of brain disease might be possible using wearable EEG devices. However, reports of research or clinical applications of wearable EEG devices are few. Therefore, the aim of this study was to investigate whether wearable EEG devices could detect changes in brain activity. In this study, we determined the association between EEG and emotional image presentation. EEG spectra were analyzed in the resting state and during emotional image presentation. The spectrum values decreased more during positive and negative image presentation than that during the resting state suggesting that decrease in the alpha (α)-wave spectrum may be induced by event-related desynchronization of the α-waves associated with emotional image presentation. In addition, Pearson product-moment correlation coefficient of the α-waves was calculated using eight electrodes to determine the α-wave coupling strength of the entire head. The correlation value between the electrodes of the occipital visual cortex during image presentation tended to be high. However, that of the frontal and occipital areas tended to be low. Thus, α-wave correlation value between the occipital visual cortex was higher than that of other regions during image presentation. These results suggest that wearable EEG devices could detect changes in brain activity associated with attention.
