The most important requirement to learning about a person's affective behavior would be in order to have a more therapeutic relationship with the patient. Hope this is the right answer and would then be of big help in this homework.
It is the theory of just noticeable differences of JND. In the branch of exploratory brain science concentrated on sense, sensation, and recognition, which is called psychophysics, a simply perceptible contrast or JND is the sum something must be changed all together for a distinction to be discernible, recognizable at any rate a fraction of the time
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