When should narrow band noise masking be delivered to the NTE for air conduction thresholds?

Narrow band noise masking is a technique used in audiometry to ensure that the non-test ear (NTE) does not respond during a hearing threshold assessment, especially in cases where there is a significant difference in thresholds between the two ears. The correct application of this technique is vital for obtaining accurate results.

In this context, the practice establishes that narrow band noise masking should be delivered to the non-test ear when the air conduction thresholds between the test ear and the non-test ear differ by 15 dB or more. This threshold is critical because a difference of 15 dB indicates a likelihood that the non-test ear could interfere with the test results by hearing sounds that are intended for the test ear. By introducing masking noise, the audiologist can ensure that any responses recorded are solely originating from the test ear.

Using narrower band noise effectively allows for the blocking of specific frequencies that are being tested, providing a clearer picture of the test ear's auditory capacity without influence from the NTE. This is essential for accurate diagnosis and treatment planning in hearing assessments.

The thresholds of 40 dB and 70 dB mentioned in other choices are significant in clinical practice but apply to different circumstances or are specific to different types of masking procedures rather than indicating