Hi Doug,
the p-values are all much lower when I combine both the counterclockwise and clockwise stimuli and the angle maps look completely different. I have noticed that for the eccentricity data I have the same problem (contracting and expanding rings).
Below you can find the images (it is macaque MION fMRI data).
Thanks,
Thomas
On 06 Aug 2012, at 19:43, Douglas N Greve wrote:
what is it that is noisy? The angle map or the p-value map? Can you send pics? doug
On 08/06/2012 12:41 PM, Thomas Janssens wrote:
Hi,
I am currently analyzing some retinotopy data. For the polar angle stimulus we had both clockwise and counterclockwise stimuli. Both of them started at the top of the screen (12 o'clock), each run includes 4 full cycles and ends with the last wedge slightly before/after 12o'clock.
We have created seperate paradigm files (direction pos / direction neg) for the clockwise and counterclockwise runs and followed the steps as indicated by the "FsFastIndividualRetinotopyAnalysis". However, when we run the Freesurfer retinotopy analysis on the whole data set, the polar angle is very noisy. When we run the same analysis separately for the clockwise and counterclockwise runs separately, the results look much better. Could anyone tell me what I am doing wrong?
Thanks!
Thomas
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