Figure 4.

Rhythmic whisker stimulation induces a long-lasting plasticity of the topography of whisker-evoked multichannel brain responses. A, Topographic maps of the averaged SEP at baseline (top) and 40–60 min after rhythmic whisker stimulation (bottom). B, Topographic maps of the averaged SEP at baseline and 40–60 min after sham stimulation in controls. C, Results of the randomization procedure for topographic dissimilarity between SEP recorded at baseline and 40–60 min after 8 Hz whisker stimulation. 1-p values are plotted at each time point (5 time points per millisecond). D, Results of the randomization procedure for topographic dissimilarity in sham-stimulated controls. E, Topographic maps (determined by an electrode-wise randomization procedure) of the directions of significant voltage differences at each electrode between the SEP at baseline and 40–60 min after stimulation during the periods of significant differences in map topography. Red color indicates larger voltage values, whereas blue color indicates smaller voltage values after stimulation compared with baseline.