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Estimated HRFs and fit parameters for one typical subject. Dots are BOLD data for subject 9, averaged within active voxels in V1, for the short-ISI experiment. Color indicates stimulus contrast (blue 5%, red 90%). Error bars show ± one standard error of the mean across voxels for a typical timepoint. Solid line is the fit HRF for these data, used to calculate HRF timing parameters. Onset latency (circle), time to peak (triangle), and FWHM (horizontal line) are illustrated.
