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Hi.
I want to compute the average across three conditions for each subject by removing any 
differences between the conditions.
For two conditions, I understand the EVs would be

EV1    EV2
1         1
1         -1

would it not, and I compute the contrast (1,0) for the average across the two conditions 
with any differences removed?

For three conditions, is it

EV1   EV2 (a)   EV3 (b)
1        1           1
1        -1          0
1        0          -1

and then compute (1,0,0) since conditions A+B+C = a+b-a-b = 0, as per the tripled t-test 
example?
I then plan to average this (1,0,0) contrast across subjects to get the mean across 
condition with any differences between the conditions removed.

-Brad