Abstract
Bekesy sweep audiometry and DPOAE were measured in 18 volunteers with normal hearing level.
Microdips were observed in 10 subjects on Bekesy, and in 12 subjects on DP-gram.
Most microdips occurred at frequencies higher than 3kHz on Bekesy, while on DP-gram at frequencies between 2 and 4kHz. The distribution of the dip frequency differed between Bekesy and DP-gram.
In 10 subjects who demonstrated microdips at the first examination, a few subjects exhibited microdips at the second examination.
These data suggest the presence of subclinical micro-cochlear dysfunction in volunteers with normal hearing level.
