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. Author manuscript; available in PMC: 2017 Mar 1.
Published in final edited form as: J Cogn Neurosci. 2015 Dec 17;28(3):379–401. doi: 10.1162/jocn_a_00903

Figure 2.

Figure 2

NIRS power spectrum at rest. Mean power spectra across all subjects show spectral inflections at approximately 0.08, 0.3, and 1.9 Hz in both the HbO2 and HbR signals. These peaks correspond to vascular, respiratory, and cardiac rhythms, respectively. Nonvascular (i.e., artifactual) signal constitutes a greater relative proportion of total power in the HbO2 signal than in the HbR signal.