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I am new using FEAT, and running into what I think is a simple error. I have 150 trials, with two conditions (80% condition 1, 20% condition 2). I have two separate files for the two conditions, each of which is a single column of 150 numbers, with 0 when that condition was off, and 1 when that condition was on. So, the two files are exactly orthogonal to each other. I then enter 2 EV's into FEAT, choose the "Custom (1 entry per volume)" option in the GLM gui, and choose the two files for the two EV's, respectively. When I go to view the design, I get the error stating that "at least one EV is (close to) a linear combination of the others. Obviously, I am doing something wrong with the definition of the EV's, but it's not obvious what the issue might be. Any help with this issue would be most appreciated, thanks! Mark