Abstract
For years, P300-based BCI (Brain Computer Interface) has been studied as a technique to support the communication of severe limb disabilities. In this study we aim to investigate the auditory stimulus suitable for BCI by measuring the P300 amplitude during an oddball task. The average of the P300 amplitude for the target stimuli and non-target stimuli were compared by t-test. We hypothesized that stimuli with the lowest p-value can be suitable for BCI. Two-stimulus oddball task was performed for 8 pairs of stimuli. Eight different stimulus (stimulus A) were paired with 1 kHz pure tone (stimulus B). Stimulus A and B becomes the target in each task, respectively. Experimental results shows that p-value was the lowest among these 8 pairs when stimulus A was the sound of two different pure tones alternately switching in a short time (alternating sound). Based on these results, 3-stimulus (stimuli C, D and E) oddball task was performed for 3 sets of 3 stimuli to determine the p-value. In each set, there were 3 tasks; where either stimulus C, D or E was the target. P-value was lowest among these 3 sets when stimuli set consists of two pure tone and one alternating sound.
