Notes and Comment Reply to Eisler: On the subtractive theory of stimulus comparison
Michael H. Birnbaum · 1979
A series of experiments found that when subjects are instructed to judge "differences " or "ratios," the rank order of the responses is virtually identical.’ Since actual ratios and differences of the same numbers are not monotonically related in suitable (factorial) designs, this finding has been interpreted as consistent with Torgerson’s (1961) theory that subjects use one comparison operation for both tasks