I. Background of the Procedure
In the original design of an experiment in masking prepared for a doctoral thesis, a number of possible masking techniques were to have been applied clinically to a group of hard of hearing patients having a differential in the hearing acuity of their two ears of 30 db. or more. A Zwislocki audiometer with the use of a two-oscillator system to mask the test tone, a continuous ear douche introduced into the nontested ear, and a specially constructed audio testing assembly utilizing wooden masking enclosures were among the procedures to have been utilized in an attempt to evolve a more satisfactory clinical masking instrument than is presently available. The use of such an approach to the problem necessitated some sort of a control. We had to know which of the techniques being employed was giving us information on the subject's actual hearing in the poorer
MILLER MH, FORMAN FS. The Use of Tympanic Injections as an Experimental Control in Masking Research. AMA Arch Otolaryngol. 1956;64(6):526–536. doi:10.1001/archotol.1956.03830180076011
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