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I'm trying to calculate d' from an experiment that used a modified method
of constant stimuli. Essentially, it is a same-different paradigm in which
S1 is presented in the first interval of a trial. On half the trials the
second interval is also S1 (same trials). The remainder of the trials are
equally distributed S1-S2, S1-S3, etc (in the current instantiation, we have
five different values S2-S6), with S2 representing the smallest change and S6
representing the largest change (the change is a increment in the level of 2
harmonics in 5-harmonic complexes). This seems like a clear example of
what McMillan and Creelman refer to as a reminder task but it wasn't clear (at
least to me) what the most appropriate way of calculating d' is from this type
of paradigm. Fitting a logistic function (Green, 1993) seems like a
reasonable solution but I wonder if there were other possibilities. Thanks for
any suggestions
Mitch Sommers
Mitchell S. Sommers, Ph.D.
Associate Professor Dept. of Psychology Washington University Campus Box 1125 St. Louis, MO 63130 |