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. Author manuscript; available in PMC: 2013 Aug 15.
Published in final edited form as: Neuroimage. 2011 Sep 22;62(2):1152–1156. doi: 10.1016/j.neuroimage.2011.08.113

Figure 1. Hemodynamic responses measured within the first study using an event-related fMRI design.

Figure 1

In this very early study, participants viewed simple visual stimuli that flashed for one second and then turned off for a long duration. These short stimuli evoked a detectible increase in the measured fMRI signal, now known as the BOLD hemodynamic response. Data from Blamire and colleagues (1992); figure from Huettel and colleagues (2009).