Relationship between Direction of sound source and P300 in Right/Left source discrimination task

Abstract

Our research's purpose is clarifying P300 characteristics related to spatial attention. In this paper, we examine laterality differences for the P300 by three tasks (Task1: directional discrimination task (20%:80%), Task2: directional discrimination task (50%:50%), Task3: simple oddball task). In task1, stimuli (1kHz pure tone) are presented on a left or a right speaker of a subject. The target stimuli are generated on one of the left or the right speaker. The stimuli are presented 100 times (target: 20 times, non-target: 80 times). In task2, the stimuli are presented 100 times (target: 50 times, non-target: 50 times). In task3, two stimuli (target: 1kHz, non-target: 500Hz pure tone) are presented on one of the left or the right speaker. The stimuli are presented 100 times (target: 20, non-target: 80). As a result, the difference of target sound direction influences the difference of a peak time in P300.