Figure 4.

Response at the fundamental frequencies. (a) SNR averaged across the two SSVEP fundamental frequencies (f₁ & f₂) for the two levels of test IOCD and three adaptation conditions averaged across occipital and parieto-occipital electrodes. Error bars are standard errors of the means (N = 16) calculated after subtracting the global mean from each subject’s data (across the two IOCDs). (b) Difference scores between the SNRs for the three adaptation conditions in (a). (c) Difference scores, as in (b), for the sixteen individual subjects.