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. Author manuscript; available in PMC: 2020 Jun 22.
Published in final edited form as: Neuroimage. 2019 Nov 25;208:116400. doi: 10.1016/j.neuroimage.2019.116400

Figure 6. Frequency domain representation of motion time series in single band data.

Figure 6.

(A) One fMRI run in a single representative participant (TR = 2.5s). All display conventions as in Fig. 5A. (B) Power spectra of 321 OHSU scans (mean age 11.6, TR = 2.5s), ordered by mean FD and stacked with lowest movers on top. Red arrow highlights respiration artifact. As in Fig. 5B the spectra were first represented logarithmically (i.e., in dB) and then Z-scored (Appendix B). The respiratory spectral peak (presumed true center frequency ~0.3 Hz) is both comparatively broad in relation to the resolved spectral range (Nyquist folding frequency = 0.2 Hz) and aliased to ~0.1 Hz = 0.2 - |~0.3 – 0.2| Hz.