What type of distortion is generally not perceived by the wearer of the hearing aid?

Transient distortion typically refers to short bursts of distortion that occur in response to rapid changes in the sound signal. This type of distortion is often relatively brief and may not be noticeable to the wearer because it does not persist long enough to interfere significantly with the overall listening experience. The brief nature of transient distortion means that it can occur during quick sounds or peaks in audio, and the brain often filters out these fleeting moments, making them less perceptible.

In contrast, intermodulation distortion and harmonic distortion generally involve more sustained effects on the audio signal that can be more easily detected by the wearer. Muffled distortion, similarly, affects the clarity of sound over time and can lead to increased listener fatigue or difficulty in understanding speech. These forms of distortion tend to have a more lasting impact on the listening experience compared to transient distortion. Therefore, the correct answer highlights a type of distortion that is less likely to be noticed in everyday hearing aid use.