Principles and practice of functional MRI of the human brain
J. Clin. Invest. John C. Gore, et al. 112:4 doi:10.1172/JCI19010 [Go to this article.]

Figure 2
In a block design experiment, sequences of images are acquired in contrasting conditions (I and II). After acquisition, those voxels whose signals change in synchrony (i to ii) with the stimulus or task can be identified.