Hi Doug,

Thanks for your response. How do I tell which refer to the eccentricity and which refer to the polar maps? I am looking for which betas are used for generating the fsig for the eccentricity maps only.

Thanks! Dan

On Thu, Jun 27, 2013 at 4:00 PM, Douglas N Greve greve@nmr.mgh.harvard.edu wrote:

The first 12 regressors are 1 and 2: fundamental real (cosine), fundamental imaginary (sine) 3 and 4: 1st harmonic real and imag 5 and 6: real and imag at a freq just below the fundamental 7 and 8: real and imag at a freq just above the fundamental 9 and 10: real and imag at a freq just below the 1st harmonic 11 and 12: real and imag at a freq just above the 1st harmonic

The rest are the betas are for nuisance variables

doug

On 06/25/2013 04:22 PM, dgw wrote:

...

Hi,

I am examining the affect a metal artifact has on fMRI data, and I am using Eccentricity mapping with the retinotopy analysis in FSFast. I was recently asked to switch from examining the difference in the fsig to examining the difference in the betas. I opened up beta.nii.gz and I can see that it has a size of:

1 #of vertices 1 39

Can you explain to me, how I figure out where each of the 39 come from (and possibly point me to which of these might be appropriate to use?)?

Thank You, Dan _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

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The first 12 are eccen and the second 12 are polar. Just the fundamentals of the real and imag components are used in the fsig. doug

On 7/25/13 3:52 PM, dgw wrote:

Hi Doug,

Thanks for your response. How do I tell which betas refer to the eccentricity and which refer to the polar maps? I am looking for which betas are used for generating the fsig for the eccentricity maps only.

Thanks! Dan

...

On Thu, Jun 27, 2013 at 4:00 PM, Douglas N Greve greve@nmr.mgh.harvard.edu wrote:

...

The first 12 regressors are 1 and 2: fundamental real (cosine), fundamental imaginary (sine) 3 and 4: 1st harmonic real and imag 5 and 6: real and imag at a freq just below the fundamental 7 and 8: real and imag at a freq just above the fundamental 9 and 10: real and imag at a freq just below the 1st harmonic 11 and 12: real and imag at a freq just above the 1st harmonic

The rest are the betas are for nuisance variables

doug

On 06/25/2013 04:22 PM, dgw wrote:

...

Hi,

I am examining the affect a metal artifact has on fMRI data, and I am using Eccentricity mapping with the retinotopy analysis in FSFast. I was recently asked to switch from examining the difference in the fsig to examining the difference in the betas. I opened up beta.nii.gz and I can see that it has a size of:

1 #of vertices 1 39

Can you explain to me, how I figure out where each of the 39 come from (and possibly point me to which of these might be appropriate to use?)?

Thank You, Dan _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

-- Douglas N. Greve, Ph.D. MGH-NMR Center greve@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/

---

Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer

The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.