Hi Anderson!
Thanks a lot! :) In an experiment like this, reaction time is actually the behavioral measure for the effect we want to measure and it should not be the same length. The problem with the CoTc condition is actually due to using a very bad example, all other conditions are fine and only the error-regressor is sometime empty (but that is not used in any contrast, only as additional variable to take this variance into account). So, everything should be fine and my problem is solved. :)
Thanks again,
Susanne
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