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. Author manuscript; available in PMC: 2017 Aug 8.
Published in final edited form as: Neuroimage. 2014 Jul 25;100:650–662. doi: 10.1016/j.neuroimage.2014.07.044

Table 2.

The table lists the total signal power of the data contained in the matrix Y; i.e. the activation level (expressed as a percentage signal change) squared, averaged across all ROI voxels and all stimulus contrasts. It also specifies how this total power is decomposed into additive contributions from the various principal components. The listed power fractions equal the corresponding signal powers expressed as a proportion of the total power; the root-mean-square (RMS) activation amplitudes equal the square root of the corresponding signal powers.

Narrowband   Broadband     Sweep
Signal power [(%)2] 1st component      0.2048      0.4009      0.1028
2nd component      0.0052      0.0008      0.0062
Other components (mean)      0.0003      0.0003      0.0003
ToTal      0.2130      0.4031      0.1125
Power fraction [‒] 1st component      0.962      0.995      0.914
2nd component      0.024      0.002      0.055
Other components (mean)      0.001      0.001      0.003
ToTal      1.000      1. 000      1.000
RMS-amplitude [%] 1st component      0.45      0.63      0.32
2nd component      0.07      0.03      0.08
Other components (mean)      0.02      0.02      0.02
ToTal      0.46      0.63      0.34