Investigation of P2 Component Using Dipole Tracing Method

Using dipole tracing method, we investigated P2 component of slow vertex response. In 24 adults with normal hearing 18 subjects achieved reasonable results. The dipole located in the fairly rear of the midline, and directed to upper-front. The dipole was considered to exist single. Although the kind of stimuli, stimulating duration, stimulating frequency were varied no remarkable change in the location and direction of the dipole was recognized. The dipole was considered to be stable. We examined the dipole related to the digital-filtered waves. The location and direction of the dipole were stable unless we cut the bands from 2 to 6Hz. We considered that the dipole tracing method is reliable and can be used without failure of the essential qualities of P2 component, and can be useful in fature clinical examination.