Re: [Freesurfer] asymmetry analyses

2014-08-27 Thread angela . favaro
Hi Doug, is there a way to perform asymmetry analyses for local gyrification index? In my xhemi folders there is no LGI surface. thank you Angela You can use --paired-diff-norm instead of --paired-diff, this will compute (L-R)/((L+R)/2) You can then divide the output by 2, eg, fscalc

Re: [Freesurfer] asymmetry analyses

2014-08-27 Thread Douglas Greve
You can copy the rh gyrification index to xhemi/surf/lh gyrification index, ie, copy it to xhemi/surf, but change the name so that it appears to be lh instead of rh doug On 8/27/14 5:47 AM, angela.fav...@unipd.it wrote: Hi Doug, is there a way to perform asymmetry analyses for local

Re: [Freesurfer] asymmetry analyses

2014-08-26 Thread angela . favaro
thank you! Angela You can use --paired-diff-norm instead of --paired-diff, this will compute (L-R)/((L+R)/2) You can then divide the output by 2, eg, fscalc output.mgh div 2 -o output.div2.mgh doug On 8/24/14 9:52 AM, angela.fav...@unipd.it wrote: Hi all, I have a question about

[Freesurfer] asymmetry analyses

2014-08-24 Thread angela . favaro
Hi all, I have a question about hemispheric asymmetry analyses. The example given in the wiki shows how to compare lh and rh using a paired t-test. Is it right? But how can I calculate (and then compare groups) the laterality index (L-R)/(L+R)? Thank you very much for any help Angela

Re: [Freesurfer] asymmetry analyses

2014-08-24 Thread Douglas Greve
You can use --paired-diff-norm instead of --paired-diff, this will compute (L-R)/((L+R)/2) You can then divide the output by 2, eg, fscalc output.mgh div 2 -o output.div2.mgh doug On 8/24/14 9:52 AM, angela.fav...@unipd.it wrote: Hi all, I have a question about hemispheric asymmetry