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. Author manuscript; available in PMC: 2009 Apr 15.
Published in final edited form as: Neuroimage. 2008 Jan 5;40(3):1181–1194. doi: 10.1016/j.neuroimage.2007.12.040

Figure 1.

Figure 1

Illustration of the median percent signal change IRF and the trough-to-peak measurement. The on block and off block are indicated. The IRF in this figure is the average of six control non-smokers.