(text seemed to slip through in the prior message)
Hi Paul,
yes I added temporal derivatives and motion confounds - however funny patterns in the EVs also appear when no derivatives are included, see the attached image of the design matrix please, which contains no derivatives -(but contains motion EVs). The only trial events are right in the diagonal but you can see how other parts of the vertical in which nothing is presented also have a change in shape.
cheers,
David
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