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. Author manuscript; available in PMC: 2020 Jul 1.
Published in final edited form as: Neuroimage. 2018 Apr 25;176:541–549. doi: 10.1016/j.neuroimage.2018.04.045

Fig. 3.

Fig. 3.

Exemplary EPI magnitude images from Subject 1, and subject-averaged (n = 8) correlation between the PPG amplitude (AMP) and fMRI at 0-lag in 6 axial slices. Positive r indicates decrease of fMRI signal during PPG AMP dip.