Relationship between Direction of sound source and differences of P300 potential on parietal cortex in Right-Left directional discrimination task by Count/Button-Press

摘要

Our purpose is clarifying P300 characteristics related to spatial attention. In this paper, we investigate laterality differences of the P300 by two tasks. In a directional discrimination task, stimuli (1kHz pure tone) are presented to a subject on a left or a right speaker. The target stimuli are generated on one of the left or the right speaker. The stimuli are presented 250 times (target: 50, non-target: 200). In a simple oddball task (right speaker), two stimuli (target: 1kHz, non-target: 500Hz pure tone) are presented on the right speaker. In a simple oddball task (left speaker), two stimuli are presented on the left speaker. The stimuli are presented 250 times (target: 50, non-target: 200). Each task is performed by button-pressing and silent-counting. As results, the difference of target sound's direction influenced the difference of P300's potentials in hemisphere only counting tasks.