Single Trial Amplitudes


Single trial amplitudes are the beta weights which are obtained by doing a Multiple Regression of the design matrix and the convolved ICA time course where the design matrix is obtained by doing a convolution of the onsets and the event averages. This utility must be used after doing temporal sorting of all data-sets in the GIFT and using only the regressors of interest. The best regressor onsets for each data set are used to compute single trial amplitudes and event averages. We determine the best regressor for each data-set based on the maximum beta weight value (not the absolute value). Figure 1 shows the orthogonal slices at the maximum voxel, event average and the single trial amplitudes for the selected components. We also store the single trial amplitude results in a file having suffix '*single_trial_results.mat'.

Figure 1: Plot shows the orthogonal slices at the maximum voxel, event average and single trial amplitudes.