ABSTRACT.In an effort to obtain a satisfactory pattern-reversal visual evoked potential (PVEP) with only a few repetitions, the standard analog bandpass of 5–100 Hz of the PVEP was reduced to 1–25 Hz using digital filters. Latencies of the response were unchanged compared with those with a bandpass of 5–100 Hz. This filtering eliminates the high frequency noise together with high frequencies, if any, contained in the response, thus improving the signal-to-noise ratio. Digital filtering makes it possible to obtain a satisfactory average with fewer responses without changing the latencies. The power spectrum of the average VEP with bandpass of 5–100 Hz of a selection of patients and of normal subjects showed only negligible percentage of activity above 20 Hz. Examples of averages with bandpass of 5–100 Hz and 1–25 Hz as well as of their power spectrum are given. Digital filtering produces satisfactory PVEP averages with lower number of responses than that usually recommended. This is an advantage when dealing with patients with short attention span.