[Freesurfer] fsfast: using an empirically derived HRF with mkanalysis-sess
hi freesurfers, i would like to use an empirically derived HRF with mkanalysis-sess. i have derived the HRF i want [via an FIR model], but it's not obvious how i can use my custom HRF with mkanalysis-sess. one option, it seems, is to feed in my own regressors with the -taskreg flag and then not supply the model with any other regressors of interest. i'd just convolve stick regressors that have the appropriate timing with my own HRF. but this would only work if selxavg3-sess does NOT convolve task regressors with the HRF. so two questions: 1. is the -taskreg flag the best way to do this? is there another, better way? 2. does selxavg3-sess convolve task regressors with the HRF? thanks, alex ___ 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.
Re: [Freesurfer] fsfast: using an empirically derived HRF with mkanalysis-sess
and one point of clarification: i only care about beta weights for each condition of interest, so i don't care that -taskreg would only run an F-test for significance maps and wouldn't give me t maps for each regressor of interest. thanks again, alex On Sun, Sep 14, 2014 at 1:55 PM, Alex Kell alexk...@mit.edu wrote: hi freesurfers, i would like to use an empirically derived HRF with mkanalysis-sess. i have derived the HRF i want [via an FIR model], but it's not obvious how i can use my custom HRF with mkanalysis-sess. one option, it seems, is to feed in my own regressors with the -taskreg flag and then not supply the model with any other regressors of interest. i'd just convolve stick regressors that have the appropriate timing with my own HRF. but this would only work if selxavg3-sess does NOT convolve task regressors with the HRF. so two questions: 1. is the -taskreg flag the best way to do this? is there another, better way? 2. does selxavg3-sess convolve task regressors with the HRF? thanks, alex ___ 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.
Re: [Freesurfer] fsfast: using an empirically derived HRF with mkanalysis-sess
On 9/14/14 1:55 PM, Alex Kell wrote: hi freesurfers, i would like to use an empirically derived HRF with mkanalysis-sess. i have derived the HRF i want [via an FIR model], but it's not obvious how i can use my custom HRF with mkanalysis-sess. one option, it seems, is to feed in my own regressors with the -taskreg flag and then not supply the model with any other regressors of interest. i'd just convolve stick regressors that have the appropriate timing with my own HRF. but this would only work if selxavg3-sess does NOT convolve task regressors with the HRF. so two questions: 1. is the -taskreg flag the best way to do this? is there another, better way? Yea, I think so. I think i added some capability to spec custom HRFs, but it was a long time ago and might not have make the conversion to version 5 2. does selxavg3-sess convolve task regressors with the HRF? No, it does not, so you're good to go. thanks, alex ___ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer ___ 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.
