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Event-triggered paradigm used for this study. The stimulus presentation and fMRI volume acquisition timeline are shown in the figure. Each trial consisted of presenting the stimulus, waiting for a short period of time for the hemodynamic response (schematized by the light shaded curve) to increase and then acquiring two whole-brain image volumes (Vol 1, Vol 2) over a 6-s time period beginning 4 s after stimulus onset. This range was chosen to cover the peak of the response.
