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Re: identification task...negative d' values.

Note that you could test if an *individual* d' value (that is, d' observed for a given observer in a given condition) significantly differs from 0 using a test described by

Gourevitch, V., & Galanter, E. (1967). A significance test for one parameter isosensitivity functions. Psychometrika, 32, 25-33.

(cf. also Marascuilo, L. A. (1970). Extensions of the significance test for one-parameter signal detection hypotheses. Psychometrika, 35, 237–243.)

The test is not very powerful however, so that interpretation of the results should be taken with caution unless you have more than, say, 300 observations per data point.


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