dear SPMers,
when i am trying to define contrasts in spm contrast manager gui it says "no valid contrast defined"
I HAVE
4 conditions (negative / positive / neutral / rest or off)
- OFF: onsets at 0, 36, 72, 108, 144, 180, 216, 252, 270, 288, 306 with a duration of 18 seconds
- Positive: 18, 162, 306 with a duration of 18 seconds
- Negative: 54, 198, 234 with a duration of 18 seconds
- Neutre: 90, 126, 270 with a duration of 18 seconds.
help please
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