RE: [Freesurfer] How to project fMRI activity of entire depth of cortex on to surface

Thank you, Dr. Greve.

Does -projfrac-max 0 1 register the maximal P value cross entire depth of cortex to the vertex on the surface?

Does -projfrac-avg 0 1 delta register the average P value cross entire depth of cortex to the vertex on the surface?

Can I use these flags in mris_preproc or mris_surf2surf during the surface-based group analysis?

Xin

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From: Douglas N Greve [mailto:greve@nmr.mgh.harvard.edu] Sent: Thu 3/5/2009 11:25 AM To: Wang, Xin Cc: freesurfer Subject: Re: [Freesurfer] How to project fMRI activity of entire depth of cortex on to surface

Do any of the other --proj flags do what you need? Eg, --projfrac-max? See the --help

doug

Wang, Xin wrote:

Hello, Freesurfer group,

The mri_vol2surf only register the fMRI activity at a certain depth of cortex, as specisfied by -projecfrac, to the cortical surface. mri_surf2surf does the same thing. I want to identify any cortical region have activation during the task, therefore, I need to project fMRI activity of entire depth of cortex onto surface. Some regions may have activity in different depth of cortex, Ideally, the significent level of these regions reflect the peak of the activity cross entire depth or the sum of significense of entire depth.

the --interp trilinear may do some toward my goal, but it elimit many activities compare to nearest.

Thanks,

Xin Wang

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