Hi!
We are doing research in visual perception. To measure subjects ability two
perceive certain stimuli we computed d' or ds. But these measures only provide
information about the ability to detect one signal.
We are in the process of designing a new experiment and we would like to know,
whether subjects can discriminate 3 different stimuli. Unfortunately we do not
see a way to use signal detection theory here. The problem is, that you can
tell a hit from some error, but what would be a false alarm?
Does anyone know of a statistical procedure that would allow us to compute
one or several indices, that could be used to measure subjects performance?
Of course this would also influence the question(s) we ask in the experiments
and probably the number of trials we need per subject and stimulus. But since
we are still in the design stage, this would not be a great difficulty.
Thanks,
--
Manni
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