Abstract
There are many reports about how the self-recording audiogram of the normal ear is changed by narrow band noise. We have compared noise audiograms of normal ears with those obtained from ears of deaf subjects for results of self-recording audiograms measured while loading narrow band noise. The noise loaded audiogram of the ear showed a trough patteren at a frequency slightly above that of the narrow (critical) band noise loaded at the peak. It was found that many noise audiograms of ears with sensorineural deafness has some different forms. These were roughly divided into 3 types : 1) a dilated trough with the central frequency at the peak, 2) displaced peak frequency, and 3) increase in the values of zones other than those of the loaded frequency. It was found that these abnormal types were associated with the affected site of sensorineural deafness and the hearing image, and were present in many patients with complaints of abnormal hearing.
