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help > Cluster-forming threshold for 1st l. analysis
Feb 3, 2016 12:02 PM | Johann Philipp Zöllner - Goethe University Frankfurt
Cluster-forming threshold for 1st l. analysis
Dear Conn-Pros,
when looking at the correlation coefficients in the Conn GUI (1st level), I get rather nice correlation maps with the arbitrary threshold of 0.25. But while these are nice, they are of course not reportable. When I perform the first level analysis, I get huge clusters in the p_corr and pFDR images. I *suppose* this has something to do with the cluster forming threshold that Conn uses to produce the corr images. So what I want to achieve is to adjust this threshold (I assume it is 0.001) for my 1st level 1-sample T-test(s). Alternatively, would it be correct to threshold the corr images using spm_imcalc like "i1<0.0001" (for example) to achieve the same effect?
I can provide code samples or images of my results if that is of any help!
Thanks in advance,
Johann Philipp
when looking at the correlation coefficients in the Conn GUI (1st level), I get rather nice correlation maps with the arbitrary threshold of 0.25. But while these are nice, they are of course not reportable. When I perform the first level analysis, I get huge clusters in the p_corr and pFDR images. I *suppose* this has something to do with the cluster forming threshold that Conn uses to produce the corr images. So what I want to achieve is to adjust this threshold (I assume it is 0.001) for my 1st level 1-sample T-test(s). Alternatively, would it be correct to threshold the corr images using spm_imcalc like "i1<0.0001" (for example) to achieve the same effect?
I can provide code samples or images of my results if that is of any help!
Thanks in advance,
Johann Philipp
Threaded View
Title | Author | Date |
---|---|---|
Johann Philipp Zöllner | Feb 3, 2016 | |
Alfonso Nieto-Castanon | Feb 4, 2016 | |
Johann Philipp Zöllner | Feb 11, 2016 | |
Alfonso Nieto-Castanon | Feb 12, 2016 | |