It actually assumes that it changes sinusoidally. I don't have a solution for a log change. Can you write a matlab line that describes it?
On 03/10/2015 07:31 PM, Jackie Lam wrote: > Hi all, > > For Freesurfer’s retinotopy analysis, does it assume that the eccentricity > ring stimulus expands/contracts linearly? > A version of eccentricity mapping stimuli that was written at the Martinos > center a long time ago presents the eccentricity in a logarithmic manner, > such that central visual field is mapped over longer time than the peripheral > visual field. Hence the question on the Freesurfer retinotopy analysis, which > was written at the Martinos too. > > Also, what can we do if our stimulus expands/contracts logarithmically? > > Thanks! > > _______________________________________________ > 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 gr...@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.
