on of apparatus; procedure and techni tpi e for testi ng; norms of audi tory acui ty; concl usi ons; bi bl i ography. The purpose of this study is to establish norms of acuity in hearing for individuals who are generally considered normal in hearing ability, and to discover the general tendencies in the distribution of acuity as well as types of deviation from the norm, Such norms are valuable particularly for the purpose of comparison in diagnosing pathological cases and for determining

more »

... for certain vocational and professional activities (18) . This study is a sequel to several years' work in the field of audition in the laboratories of the State University of Iowa which has resulted in the construction of the Iowa Pitch Range Audiometer; this apparatus is a result of the efforts and cooperation of several departments, principally Otology. Physics and Electrical Engineering with that of Psychology (a, p. 3).