Thanks for your reply. I'm aware of that passage. However, I don't think it is possible to calculate D3-D6 measures when Inquisit is recording only the latency for the correct response. In this case, there is an error penalty built into the procedure, because after an initial error subjects need time to figure out the correct answer and press the appropriate key. D3-D6 measures do not use this "built-in" error penalty, bud add a constant to the inital (false) response (i.e., either 600ms or 2SD). Consider the introduction to the SPSS syntax provided on Anthony Greenwald's homepage:
For the D-score with built-in error penalty:
"D_biep is the preferred IAT measure when the IAT procedure allows subjects to correct errors *AND* records latency to the occurrence of the eventual correct response. This is the procedure used in the Generic IAT available on my web site, at: http://faculty.washington.edu/agg (follow link to IAT MATERIALS)."
For the D600 algorithm:
"D_600ep is one of two preferred measures when the IAT procedure does not allow subjects to correct errors, and latency on each trial is recorded as of the
occurrence of the error response. This is *NOT* the procedure used in the Generic IAT available on my web site: http://faculty.washington.edu/agg (follow link to IAT MATERIALS). For IATs done with the Generic IAT it is appropriate to use the D measure for built-in error correction. The generic syntax for that is in the file: 'D_biep.Inquisit Generic IAT SPSS syntax form.26Nov05.doc'."
In sum, I still think in order to be able to calculate all 6 possible D scores, it is necessary to know the latency of the first response to calculate D600 and D2SD (correct or incorrect) and also the latency of the first correct response after an initial error to calculate D with a built-in error penalty. Any ideas how this could be done in Inquisit?
Thanks for any comments.