On the Quantification of SSVEP Frequency Responses in Human EEG in Realistic BCI Conditions
Figure 5
Test of magnitude of nSNR response for pairs of frequencies.
White pixel indicate a pair of stimulation frequencies (one from horizontal, and one from vertical axis) which do not show significant differences in mean nSNR response, black pixel indicates that the difference is significant. Color squares indicate contiguous frequency ranges which pairwise have equal mean responses.