Methods Of Psychophysics ~circa1860
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thus sayeth gustav theodore fechner: make the patient repeatedly adjust a variable stimulus until it appears equal to a standard stimulus, a difference threshold being calculated as the probable error of the adjustment option 2: apply stimulus to the patient in a random order and determining the smallest intensity that can be detected in the case of an absolute threshold or the smallest difference from a standard stimulus that can be detected in the case of a difference threshold, the criterion used nowadays usually being correct detection or discrimination on 75% of presentations, although other percentages are sometimes used. option 3: present the patient an ascending series in which the intensity of a variable stimulus is increased by predetermined steps until it can be perceived on 50% of presentations
