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November 1957

Effect of Masking on Induced Conduction Deafness

Author Affiliations

Department of Otolaryngology, Jefferson Medical Center.

AMA Arch Otolaryngol. 1957;66(5):584-587. doi:10.1001/archotol.1957.03830290090011

It has been demonstrated that masking with 80 db. of white noise re normal threshold (95 db. re 0.0002 dyne per square centimeter) can for clinical purposes eliminate a normal hearing ear while testing the opposite ear by bone conduction. With this degree of masking there is no significant overmask.1 It is frequently necessary to use masking in an ear which has some degree of conduction deafness. There is no experimentally confirmed knowledge of the degree of masking necessary in such an ear or the effectiveness of usually employed intensities in various degrees of conduction deafness. The object of this study is to determine the difference in response to masking of a normal ear and of one with experimentally induced conduction deafness as measured by crossed bone conduction.

Material and Method  For the purposes of this investigation 20 subjects with unilateral complete deafness were selected. This degree of deafness