You can use the following matlab code. You can ignore the warning 
printed after the toepliz operation. The OriginalRegressor should be a 
vector of length Ntp, then write out the NewRegressor to a new external 
regressor file.

TR=2; % seconds

Ntp=100;
t = TR*[0:Ntp-1]';

h = fast_spmhrf(t);

a = zeros(Ntp,1); a(1) = 1;
X = toeplitz(h,a);

NewRegressor = X*OriginalRegressor;



On 02/21/2017 04:02 PM, Reza Rajimehr wrote:
> Hi Doug,
>
> Since our external regressors are stimulus-related (e.g. mean 
> luminance of stimuli), we need to convolve them with a hemodynamic 
> response function. In mkanalysis-sess, we have used -spmhrf 0 to model 
> conditions. Is there a code or Matlab script for HRF convolution, so 
> that we apply exactly the same spmhrf function for modeling the 
> external regressors?
>
> Thanks,
> Reza
>
> No, they are not
>
>
> On 02/17/2017 05:09 PM, Reza Rajimehr wrote:
> >/During the functional analysis in FS-FAST, are the external regressors />/convolved with the hemodynamic response function? />//>/Thanks, />/Reza />//>//>/_______________________________________________ />/Freesurfer mailing list />/Freesurfer at nmr.mgh.harvard.edu 
> <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> />/https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer /
> -- 
> Douglas N. Greve, Ph.D.
> MGH-NMR Center
> greve at nmr.mgh.harvard.edu 
> <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer>
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-- 
Douglas N. Greve, Ph.D.
MGH-NMR Center
greve at nmr.mgh.harvard.edu
Phone Number: 617-724-2358
Fax: 617-726-7422

Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting
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