According to ludy benjamin, if changes in physical stimuli always resulted in similar changes in perception of those stimuli,

The answer is " psychology would not be need".

In physiology, a stimulus of which the plural is stimuli, is a noticeable change in the inner or outside condition. The capacity of a life form or organ to react to outside stimuli is called sensitivity. At the point when a stimulus is connected to a tangible receptor, it normally evokes or impacts a reflex through stimulus transduction.