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. Author manuscript; available in PMC: 2009 Feb 1.
Published in final edited form as: Clin Neurophysiol. 2008 Feb;119(2):399–408. doi: 10.1016/j.clinph.2007.09.121

Figure 2.

Figure 2

Spectral power and R2 values for subject R. Panels A and C show the power spectra over sites O1 and O2 from 0−65 Hz when the subject focused on the 6 Hz checkerbox (solid line) or the 15 Hz checkerbox (dotted line). Panels B and D show the R2 between the two lines in panels A and C. Panel E shows a topographic map of R2 differences at all sites for that subject over six frequencies: the two stimulation frequencies (6 and 15 Hz) and the second and third harmonics of each. Please note that this figure presents data derived with different stimulation frequencies than the subsequent figures.