In
psychology, Fechner's Law says that the change in the
intensity of a
sensation is a function of the change in the intensity of the
stimulus divided by the magnitude of the current intensity of the stimulus.
What this means is that if you are listening to music at 23
decibels and your turn it up 17 decibels, you will feel a certain increase in the sound. If you then turn it up another 17 decibels the difference
you hear is less than the difference the original time you turned it up.
This applies to all types of
stimuli, including
heat,
noise, and
sight.