Physiology regression GLM fnirs course bug

[andycasey]

In PhysiologyRegression_GLM_fnirs_course.m there seems to be a bug in that the comments indicate the maximum allowed shift for additional regressors is 20 seconds, but the code allows for the maximum shift to be 20 samples, where a sample is taken every 3.9 seconds. So the existing code allows for additional regressors to be up to ~80 seconds lagged.

From PhysiologyRegression_GLM_fnirs_course.m:

        if ~isempty(AdditionalRegressors)
            
            % Perform shift in each additional regressor
            % that maximizes the correlation with the fNIRS channel.
            % The maximum allowed shift is 20 seconds.
            
            maxLag = round(20*SD.f);

Here SD.f is the sample frequency (in Hz), which for the example data set is 3.9 Hz.