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A group of medical students was shown a series of instructional videotapes while taking a required neurology clerkship. Overall, this study group was more accurate (p less than 0.01) in diagnosing illustrated conditions than a control group that did not see the videotapes. Videotape instruction produced better performance in identification in only certain areas: neuropsychologic phenomena, disorders with subtle or unique movements, and seizures. The choice and cost of equipment and some professional assurances are discussed. Costs and professional expectations, as well as the limited usefulness of videotapes, must be acknowledged by clinical departments before embarking on videotape instruction.