IHS Auditory Assessment 3

Question 1

The rollover index (RI) is calculated during which audiometric test?

Accepted Answer

Performance-intensity function for word recognition

Answer

The rollover index is derived from the performance-intensity (PI) function for word recognition and is used to identify retrocochlear dysfunction when PI scores decrease significantly at high intensity levels.

Question 2

Which audiometric configuration is most consistent with noise-induced hearing loss (NIHL)?

Accepted Answer

Notch at 4000 Hz with recovery at 8000 Hz

Answer

Noise-induced hearing loss characteristically presents as a notch at 4000 Hz (sometimes 3000–6000 Hz) with partial recovery at 8000 Hz, reflecting the resonance properties of the ear canal.

Question 3

When should the audiologist introduce inter-aural attenuation (IA) values when deciding whether to mask?

Accepted Answer

When the signal presented to the test ear could cross over to the non-test ear

Answer

Masking is needed whenever the signal level in the test ear exceeds the inter-aural attenuation, meaning the signal could reach the non-test cochlea and give a false response.

Question 4

A 1000 Hz probe tone is preferred over 226 Hz for tympanometry in which population?

Accepted Answer

Infants under 6 months of age

Answer

A 1000 Hz probe tone is recommended for infants under 6 months because their highly compliant ear canals and mobile middle ear systems are better assessed at higher probe tone frequencies.

Question 5

The auditory brainstem response (ABR) Wave V is generated primarily by which structure?

Accepted Answer

Inferior colliculus

Answer

Wave V of the ABR is thought to originate predominantly from the inferior colliculus (midbrain), and it is the most robust and clinically important wave for threshold estimation.

IHS - International Hearing Society Practice Test

IHS - International Hearing Society Practice Test

IHS Auditory Assessment 3