閾値判定が容易なABR検査法

―Chirp ABRについて―

抄録

A chirp stimulus is designed to compensate for the temporal dispersion in the cochlea related to the traveling wave delay. In response to a brief stimulus the cochlear traveling wave takes some time to propagate from the base of the cochlea to its apex. Therefore, the different neural units along the cochlear partition will not be stimulated at the same time and the neural activity across all nerve fibers will be smeared. This lack of temporal synchrony can be partly neutralized by an upward chirp stimulus, consisting of higher frequency components. The design of chirp stimuli must be based on a model of the cochlear delay. Chirp stimuli provide larger wave V amplitude compare with click stimuli.