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Brainstem auditory evoked potentials

A comparison of two high-frequency filter settings

Division of Otolaryngology, Department of Neurology, Neil Hellman Medical Research Building, Albany Medical College, Albany, NY.

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, III 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.

Address correspondence and reprint requests to Mr. Cacace, Division of Otolaryngology, Albany Medical College, Albany, NY 12208.

Accepted for publication October 16, 1979.

This study was supported in part by the Robert W. Graves Memorial Fund and a grant from the Muecular Dystrophy Association.