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SPM for programmers » Manual convolution with the HRF
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Tips Martin Pyka on 19 Aug 2011 04:49 pm

Manual convolution with the HRF

With the help of two SPM-functions you can manually convolve time series in Matlab. This might help to understand how the convolution with the HRF (or any other function) affects the time series. Here is an example:

% create a time series
reg = [zeros(10,1); ones(10,1); zeros(10,1); ones(10,1); zeros(10,1)];
plot(reg)

% create a basis function, in this case the hrf
bf = spm_get_bf
% with a tr of 2.2 and HRF as basis function you receive
dt: 2.2000
name: 'hrf'
length: 33
order: 1
bf: [15x1 double]
% these are necessary definitions for the spm_Volterra-function
U.u = reg;
U.name = {’reg’}; % U needs a name, but the string has no meaning
% convolve reg with the hrf
convreg = spm_Volterra(U, bf.bf);
plot(convreg)

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