In the present hearing tests in which a tuning fork or an audiometer is used, the response of the patient is the only indicator and there is no alternative but to depend upon his answer for the decision of confidence limit. Thus these hearing tests can be used only for those who are old enough to answer accurately and have normal mentality and intellect. In our daily hearing tests we experience the grestest difficulty in the case of very young children, who cannot make their sound perception known by answering questions accurately. Even some adults are not intelligent enough to answer correctly or, for some reason, try to feign illness. Under these circumstances it becomes necessary to use so-called objective audiometry. If the tester could eliminate the element of subjectivity in the response of the patient, and if he could obtain exact results by using as indicators reflexes and movements
SHIMIZU H, SUGANO T, SEGAWA Y, NAKAMURA F. A Study in Psychogalvanic Skin Resistance Audiometry. AMA Arch Otolaryngol. 1957;65(5):499–508. doi:10.1001/archotol.1957.03830230075014
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