THE AUDIOGRAM recorded in instances of monaural deafness when the receiver is placed at the deaf ear is called the "shadow curve." Apparent hearing with the deaf ear is called "shadow hearing."
It seems that the phenomenon of shadow hearing was known to pioneers of otology and in the era preceding the invention of the audiometer. Bezold1 made the remark, "Hearing which appears to be in the deaf ear represents in reality an attenuated reflection (ein abgeschwächtes Spiegelbild) of the hearing in the healthy ear." The factor instrumental in the process of shadow hearing is generally regarded as the transmission of sound waves to the opposite side across bone. According to Bunch,2 however, the sound can be heard through or around the head, i. e., by bone or by air conduction. This concept appears refuted by the fact that the tone is greatly enhanced when a finger is
TSCHIASSNY K. MECHANISM OF SHADOW HEARING. AMA Arch Otolaryngol. 1952;55(1):22–30. doi:10.1001/archotol.1952.00710010029004
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