What percentage rollover would be considered positive when doing speech discrimination testing at suprathreshold levels?
Speech recognition rollover is one of the special tests that, in the pre-ABR and pre-MRI era, comprised the battery of tests that were helpful for screening for retrocochlear pathology. ABR significantly increased the sensitivity of auditory testing to VIIIth nerve lesions and MRI was found to be significantly more sensitive than ABR. As a result, acoustic neuromas and other lesions of the VIIIth nerve and cerebellopontine angle are now typically under a centimeter in diameter at detection and often under 0.5 cm. Before ABR and MRI, two-, three-, and four-cm tumors at detection were common. Consequently, those special tests represent an important development in the history of diagnostic audiology but are no longer in widespread use. There are two classic papers on speech recognition rollover for detection of retrocochlear pathology. Jerger and Jerger (1971) measured speech recognition rollover for 41 subjects with cochlear hearing loss and 16 subjects with retrocochlear pathologies. Th
