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Physiologically plausible HRFs produce phase shifts close to the data. Both the SPM HRF and an example of a simulated faster HRF are expected to induce phase shifts close to those observed in the fMRI responses, with slightly closer matches from the fast HRF in this case. Because the best HRF cannot be analytically identified, this plot shows only a single example of an HRF with faster dynamics; other waveforms may also perform well.
