This article is based on a paper presented by Dr. Sergeant at the November 1961 meeting of the American Speech and Hearing Association in Chicago. The opinions or assertions contained in the article are the private ones of the authors and are not to be construed as official or reflecting the views of the Navy Department or the Naval service at large.

Russell L. Sergeant (Ph.D., Ohio State University, 1962) is Research Audiologist and J. Donald Harris (Ph.D., University of Rochester, 1942) is Head, Auditory Research Branch, U. S. Naval Medical Research Laboratory, Groton, Connecticut.