Fig. 4.
Left, Topographic display of amplitude differences (ΔA) atfc = 7.41 Hz between perceptual dominance and nondominance for subject J.S. Contours of constant ΔA are indicated in steps of 0.2 picotesla;dashed lines are for ΔA < 0 picotesla, and solid lines are for ΔA ≥ 0 picotesla. The circlesindicate channels with SNR >5. The circles filled ingreen indicate channels that were individually significant after Bonferroni correction (p< 0.05). Top right, Distribution of permutation samples of the summed squared power difference. Permutation samples were obtained by randomizing the pairing between MEG records and the response functions, yielding 8! (= 40320) samples including the observed pairing. The power difference was squared and summed over all channels with SNR >5 (n = 80). The red bar indicates the observed power difference that has significance p < 0.005, as determined from the permutation distribution. Bottom right, Histogram of permutation samples of the power difference at a single channel. The observed difference is indicated by a green bar. After Bonferroni correction, this difference was significant atp < 0.05. The channel shown is indicated by ablue dot on the topographic map.