Which test component uses a performance-intensity function to help differentiate retrocochlear from cochlear pathology?

Which test component uses a performance-intensity function to help differentiate retrocochlear from cochlear pathology?

• A. Otoacoustic emissions
• B. Auditory brainstem response (ABR)
• C. Speech recognition testing
• D. Performance-intensity phonetically balanced (PI-PB) function

Answer: (D)

The key idea is how speech understanding changes as you raise the loudness, using a performance-intensity curve for phonetically balanced words. This PI-PB function plots percent correct on PB word recognition across different presentation levels. In cochlear (sensory) pathology, increasing intensity typically improves performance up to a ceiling but doesn’t show a sharp decline at higher levels. In contrast, retrocochlear (neural) pathology often produces a rollover effect: after a certain level, further increases in intensity lead to worse performance. This rollover is a hallmark that helps distinguish retrocochlear from cochlear problems. So, the PI-PB function is specifically designed to reveal how performance changes with intensity and to detect rollover, making it the best tool for differentiating retrocochlear from cochlear pathology. Otoacoustic emissions assess outer hair cell function and don’t track performance across intensity; ABR looks at neural conduction but isn’t based on a speech-perception performance curve; standard speech recognition testing at a single level won’t reveal the rollover pattern.

The key idea is how speech understanding changes as you raise the loudness, using a performance-intensity curve for phonetically balanced words. This PI-PB function plots percent correct on PB word recognition across different presentation levels. In cochlear (sensory) pathology, increasing intensity typically improves performance up to a ceiling but doesn’t show a sharp decline at higher levels. In contrast, retrocochlear (neural) pathology often produces a rollover effect: after a certain level, further increases in intensity lead to worse performance. This rollover is a hallmark that helps distinguish retrocochlear from cochlear problems.

So, the PI-PB function is specifically designed to reveal how performance changes with intensity and to detect rollover, making it the best tool for differentiating retrocochlear from cochlear pathology. Otoacoustic emissions assess outer hair cell function and don’t track performance across intensity; ABR looks at neural conduction but isn’t based on a speech-perception performance curve; standard speech recognition testing at a single level won’t reveal the rollover pattern.