Dear Freesurfers I started using rtview to be able to delineate regions in my retinotopy data, however, I ran into problem with the fsig.nii file. I do my analysis in SPM, so I create the sine, cosine and significance images there as follows:
The sine and cosine images are regressors (parametric modulators) in the GLM. They seem to be all right, and I get nice revearsals in tksurfer using the RYGB wheel and complex display option. I generated an F-contrast (sine and cosine activations different from baseline), then calculated significance values myself knowing the degrees of freedom. I also converted the values to -log10 scale. Now, if I use this images with rtview, I get sparse activations across the brain and almost nothing in the visual regions. Interestingly, if I use the F contrast image (including F values) as fsig.nii, I get nice activations and reversals in the visual regions (and many also elsewhere), however, I think that's not the way I should do. Can someone help me what I am doing wrong? Thanks a lot! Best Agoston
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