Brainstem auditory evoked potentials: a comparison of two high-frequency filter settings.

Filter bandpass characteristics are important elements in all modalities of evoked potential recordings. We studied the brainstem auditory evoked potentials by changing the bandpass of the recording system between 150 to 1500 Hz and 150 to 3000 Hz. The 150- to 1500-Hz bandpass prolonged the absolute latencies of the various waves, whereas the interpeak latencies (I to III, IIII to V, III to IV/V, I to V, or I to IV/V) were not significantly altered. The 150- to 1500-Hz filter reduced notched or multipeaked wave forms by decreasing the raw high-frequency input activity.