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Hi, Doug Apologies in advance for many basic questions in previous email. I figure out the visualization problem after correcting the command. I re-run the data using changed parameter file shown in attachment. However, the result have no change at all. The whole commands (step-by-step, lh only): preproc-sess -s sess01 -fsd bold -stc odd -surface fsaverage lhrh -fwhm 5 -per-run mkanalysis-sess -fsd bold -analysis stereozero.sm5.lh -surface fsaverage lh -fwhm 5 -paradigm stereo-vs-zero.par -event-related -spmhrf 0 -refeventdur 16 -TR 2 -nconditions 2 -polyfit 2 -per-run mkcontrast-sess -analysis stereozero.sm5.lh -contrast stereo-vs-zero -a 1 -c 2 -nosumconds selxavg3-sess -analysis stereozero.sm5.lh -s sess01 tksurfer-sess -s sess01 -analysis stereozero.sm5.lh -c stereo-vs-zero
Can you give me some advice ？ Thanks! best, star [image: 3d_vs_zero-diaparity.jpeg] [image: zero-disparity_vs_fixation.jpeg] [image: 3d-fixation.jpeg]
Greve, Douglas N.,Ph.D. DGREVE@mgh.harvard.edu 于2019年1月10日周四 上午7:32写道：
did you look at the zero-disparity vs fixation contrast? Can you send your paradigm file? Can you send pictures?
On 1/9/19 12:26 AM, xi star wrote:
External Email - Use CautionHi! FS Experts! In the fMRI experiment, there are 2 conditions: 1# 3D picture 2# zero disparity picture interleaved with fixation block (0).
To compare 3D-vs-zero disparity, I used command: mkcontrast-sess -a 1 -c 2 -nosumconds but the results showed more activation then expected. To find the problem, I compared 3D-vs-fix (-a 1 -c 0), the result shows the same as 3D-vs-zero disparity. My question is: why the two contrast ( [1 0; 0 -1] and [1 0] ) came to the same result? How can I compared the two conditions? Thanks a lot ! Yours, Star
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