[Freesurfer] Re: question about h_NNN.dat volumes

2006-07-12 Thread Doug Greve
Sebastian Moeller wrote: Hi Doug, On 11. Jul 2006, at 19:56 Uhr, Doug Greve wrote: Hi Sebastian, those are scaled to a global mean of 1000 (so you can think of them as tenths of percents) -- but it's global, not local. So (I am a bit dense, sorry for that), I could just use those

[Freesurfer] Re: question about h_NNN.dat volumes

2006-07-12 Thread Sebastian Moeller
Hi Doug, On 11. Jul 2006, at 19:56 Uhr, Doug Greve wrote: Hi Sebastian, those are scaled to a global mean of 1000 (so you can think of them as tenths of percents) -- but it's global, not local. So (I am a bit dense, sorry for that), I could just use those values as basis to directly (multi

[Freesurfer] Re: question about h_NNN.dat volumes

2006-07-11 Thread Doug Greve
The h volume is a little nasty (blame Anders:). If you want the stddev of the residual error, there should be a rstd.mgh file there. If you want to know about the h volume, read on. doug selxavg-sess creates a directory called bold/analysis in which several volumes will be stored. One of the

[Freesurfer] Re: question about h_NNN.dat volumes

2006-07-11 Thread Doug Greve
Hi Sebastian, those are scaled to a global mean of 1000 (so you can think of them as tenths of percents) -- but it's global, not local. Yes, you can divide the h volume by the h-offset to give you local percent signal change. This makes me a little uncomfortable because you can get some funny

[Freesurfer] Re: question about h_NNN.dat volumes

2006-07-11 Thread Sebastian Moeller
Hi Doug, a related question, why do the h volumes show differing values for voxels at the odd "time points", supposedly the residual variance per condition, while fast_ldsxabfile only returns one value per voxel for the residual error variance? My expectation is to just have a single eresvar