It has been widely reported that the late positive component (P
3) of Auditory Evoked Potentials (AEP) was elicited by the onset of task-relevant stimulus. It also has been reported that when the stimuli differ only in duration, the offset of task-relevant tone evokes the AEP with P
3. In this study, it was hypothesized that P
3 can be evoked by a task-irrelevant tone as well as by a task-relevant one if subject starts processing every tone as the task-relevant one from its onset. The task-relevant tone was a medium-duration tone and prior to the task, the subject was trained to anticipate the cessation of the medium-duration tone (600ms) without actual offset. Results showed that when the duration was short (300ms), P
3 was evoked by the offset of tone. However, when it was long (1200ms), P
3 was elicited at the time of the offset of the task-relevant tone. These findings were interpreted to mean that the termination of time estimation activity for the task-relevant tone evoked P
3 component.
抄録全体を表示