Figure 1 | Scientific Reports

Figure 1

From: Development of an electrooculogram-based human-computer interface using involuntary eye movement by spatially rotating sound for communication of locked-in patients

Figure 1

Theoretical horizontal EOG waveforms with respect to the rotating directions of auditory stimuli. Two sound stimuli spatially rotating either clockwise (CW) or counterclockwise (CCW) with different tone frequencies were simultaneously provided around the subject’s head with the subject’s eyes closed. Horizontal EOG shifts would be shown in different patterns with 180° phase difference, depending on which sound stimulus the subject was selectively attending to.

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