Thanks Matthew,
It did run after removing the first contrast as you suggested. I was surprised with the results however.
The (original) second contrast (-1 1 1 1) showed complete saturation of significance (bright yellow) over the whole brain.
The other contrasts showed very little. This might have been the true result, however I have also run the same data through Freesurfer which showed several significant clusters of cortical thickness difference, especially with the last 2 contrasts.
Any comment on this?
Jay
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