Rollover signs make loud amplification harmful to retrocochlear patients

Evidence

Figure 8–2 illustrates a performance-intensity (PI) function, which is a plot relating performance on a speech task (here, word recognition scores in percent correct). The PI function consistent with a cochlear site of lesion is plotted using solid symbols, and the PI function demonstrating rollover is plotted with unfilled symbols. This patient needs referral, as the rollover may indicate a retrocochlear site of lesion. Importantly, large amounts of amplification would be contraindicated for this patient due to his poor word recognition scores at higher stimulus levels. — Jennifer Lentz, Psychoacoustics- Perception of Normal…, 1758

Categorization

• DEFINE: Introduces the performance-intensity (PI) function, a plot of speech performance against presentation level.