The literal translation is 'tired ears.' Ear Fatigue is not really a clinically recognized state, but audio professionals have been referring to it for years. It's caused by a combination of TTS (Temporary Threshold Shift) and general fatigue. The condition we call ear fatigue usually occurs after many hours of listening to or working with audio, especially when working at relatively high SPL's. It causes us to not hear the sound in the same way we do when we are fresh. Sometimes people report soreness of the ears associated with this, but not always. There are ongoing studies of this phenomenon, and the phenomenon of fatigue and how it affects performance in general, but much remains unknown. Suffice to say that making critical audio decisions while in a fatigued state is not advised and generally results in doing the work over again
Listener fatigue can occur when listening for extended periods of time to certain material. The exact cause has been the subject of debate, but it is generally accepted that it can be caused by the introduction of artifacts in the program material.
This is an extension of the quantifiable psychological perception of sound, adding time-variance effects.
If listeners get fatigued when listening to a radio station they may tune out, and either consciously or unconsciously they may come to avoid listening to that station.
Data-reduction systems are another possible reason why listener fatigue can creep in. The constant quest for greater loudness, an obsession with pushing levels to the maximum, and a lack of understanding of the ways in which digital equipment can generate distortion all seem to lead to an increase in listener fatigue. However, the understanding of what causes fatigue is still relatively limited.