Hi all, I was running an event-related analysis where the number of targets change, and I would really like to find an area that tracks their behavioral performance so that it would increase as set size increases, but then level off when performance does.
Basically I have 5 set sizes, 1,2,3,4,6 items. performance increases to set size 4 then plateaus. And I want to find an area of the brain that reflects this same pattern. For now, I've been looking at areas that are more active for the higher set sizes than lower ones, but I'd really like to weight the set sizes by their performance so that where performance is flat, we'd see flat activity too. Does that make sense? I see that in Freesurfer version 5 you can use external task regressors, is that what I want to use? And if so, how do I do that? Is there any way to do this in version 4.5? Katie
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