Abstract

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Title:: Effects of photostimulus color and mode variation on EEG alpha wave synchronization

Author(s):: HOU Yufan1; QIN Yurong1; CHEN Ni2; 1.School of Computer, Electronics and Information, Guangxi University, Nanning 530004, China 2. Life Sciences Institute, Guangxi Medical University, Nanning 530021, China

Keywords:: Keywords: photostimulus color binocular homo-frequency binocular dual-frequency brain alpha wave phase synchronization

Abstract:: Abstract: Whether alpha wave synchronization is correlated with stimulus color is explored under the stimulus modes of binocular homo-frequency and binocular dual-frequency in low-, medium- or high-frequency ranges which are (fI±3), (2fI±3), and (4fI±3) Hz, respectively (colors being red, green, blue, where fI represents the spontaneous alpha wave frequency). Normalized Shannon entropy is served as an indicator to evaluate the degree of alpha wave synchronization, and the effects of stimulus modes and color combinations on alpha wave synchronization are investigated. The results indicate that under the stimulus modes of binocular homo-frequency and binocular dual-frequency in the low-, medium- or high-frequency ranges, regardless of red, green or blue light, the degree of alpha wave phase synchronization varies in an "Arnolds tongue" shape, with red > green > blue (in term of synchronization degree). Under the stimulus of binocular dual-frequency and different color lights, a change in the stimulus frequency of one eye affects the alpha wave synchronization of the other eye. These findings offer new insights for the diagnosis and treatment of cognitive impairment, and the combination of stimulus frequency, color and mode can address limitations in stimulus frequency selection for brain-computer interface technology.