This is exactly what we are trying to do, but with 4 conditions. In response to this post, we are adding a column for each subject to represent the subject effects. Since there are 4 rows (ie, condition) for each subject, in each subject's EV we are adding four 1's (the rest are 0's). When we click "view design", we get an error that "at least one EV is (clise to) a linear combination of the others. You probably need to alter your deisgn. (Design matrix is rank deficient - ratio of min:max eigenvalues in SVD of matrix is 7.21649e-17)." Note that this error does not appear with out these subject EV's in the model. How do you indicate subject effects when each subject has, in our case, 4 inputs? MANY THANKS!
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