IHS Verification and Validation Methods 4

Question 1

Which of the following best describes 'coupler gain' as used in hearing aid verification?

Accepted Answer

The gain measured in a 2 cc coupler under standardized laboratory conditions

Answer

Coupler gain is measured using a standardized 2 cc coupler in controlled lab conditions and represents the hearing aid's acoustic output independent of an individual's ear canal acoustics.

Question 2

A hearing specialist uses the Client Oriented Scale of Improvement (COSI) with a new patient. What is the primary purpose of this tool?

Accepted Answer

To identify specific listening situations the patient wants to improve and then rate improvement after fitting

Answer

The COSI is a patient-centered outcome measure where the patient identifies up to five personal listening goals, then rates the degree of change and final ability after fitting.

Question 3

What is the significance of the 'audibility index' or aided SII value of 0.60 or higher for hearing aid fittings?

Accepted Answer

It suggests a fitting that provides adequate audibility for most speech sounds at conversational levels

Answer

An aided SII of approximately 0.60 or greater indicates that a sufficient portion of the speech spectrum is audible, generally correlating with good speech understanding potential.

Question 4

Which factor most significantly affects the difference between 2 cc coupler measurements and real-ear measurements?

Accepted Answer

Individual ear canal acoustics and residual ear canal volume

Answer

Each patient's ear canal has a unique shape, size, and resonance, creating differences between the standardized 2 cc coupler response and the actual in-situ sound pressure at the eardrum.

Question 5

When performing speech-in-noise testing as part of hearing aid validation, which score would most strongly indicate that the current fitting is inadequate?

Accepted Answer

A QuickSIN score showing SNR loss of 15 dB with no improvement from unaided baseline

Answer

A large SNR loss on the QuickSIN with no aided improvement over unaided performance indicates the current fitting provides no meaningful benefit for speech understanding in noise.

IHS - International Hearing Society Practice Test

IHS - International Hearing Society Practice Test

IHS Verification and Validation Methods 4