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... it was the resolution (minimum change) that I was looking for ...
The contrast threshold can be defined as the minimum contrast that can be resolved by the patient.
Imagine you are in an artificially lit room, you then leave the room to make a cup of tea and whilst you're gone I adjust the brightness of the light. What is the smallest change in light level you would notice?
... Put it another way: if someone was trying to sell you a brighter light, how much brighter would it have to be in order to notice any difference?
what keyword did you have to feed Google?
Yes, the ear's sensitivity to change varies a bit with level and frequency, but figures from Reisz, and Dimmick & Olson are comparable with what I quoted above from my student days.