SSVEP responses to stimuli of different sizes; organization of the plot as in <b>Figure 2</b>.

<p>SSVEP responses to stimuli of different sizes; organization of the plot as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112099#pone-0112099-g002" target="_blank"><b>Figure 2</b></a>.</p

SSVEP responses to stimuli with and without fixation point; organization of the plot as in <b>Figure 2</b>.

<p>SSVEP responses to stimuli with and without fixation point; organization of the plot as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112099#pone-0112099-g002" target="_blank"><b>Figure 2</b></a>.</p

The results of post-hoc Wilcoxon signed-rank for comparison of SSVEP magnitude pairs evoked by different coloured stimuli in experiment I.

<p>The results of post-hoc Wilcoxon signed-rank for comparison of SSVEP magnitude pairs evoked by different coloured stimuli in experiment I.</p

SSVEP responses to circle and square stimuli; organization of the plot as in <b>Figure 2</b>.

<p>SSVEP responses to circle and square stimuli; organization of the plot as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112099#pone-0112099-g002" target="_blank"><b>Figure 2</b></a>.</p

SSVEP responses to circle and square stimuli; organization of the plot as in <b>Figure 2</b>.

<p>SSVEP responses to circle and square stimuli; organization of the plot as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112099#pone-0112099-g002" target="_blank"><b>Figure 2</b></a>.</p

SSVEP responses to stimuli of different colours; organization of the plot as in <b>Figure 2</b>.

<p>SSVEP responses to stimuli of different colours; organization of the plot as in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0112099#pone-0112099-g002" target="_blank"><b>Figure 2</b></a>.</p

Parameters of the stimulus used in Experiment I.

<p>Parameters of the stimulus used in Experiment I.</p

Relative power increase for SSVEP response to different colours of stimuli.

<p>Mean computed for all the subjects. Error bars indicate standard error of the mean (SEM). Horizontal lines above the bars indicate statistically significant differences on the level of p<0.001 (***), p<0.01 (**), and p<0.05 (*).</p

SSVEP frequency response curves.

<p>Columns correspond to the method of SSVEP evaluation: Left – spectral power, right – Signal to Noise Ratio. Rows 1–10 correspond to individual subjects, last row shows the response averaged across 10 subjects. Horizontal axis – stimulation frequency. Vertical axes have two scales. In the left column: left scale – normalized power , right scale – absolute mean power . In the right column: left scale – values of , right scale – values of . Error bars indicate the RMS error. Each plot presents two curves: the blue line shows values obtained for NVS, and the red one for VS condition. The gray regions in rows 1–10 mark the frequencies, where the given measure (column) gives significantly higher result for VS than NVS epochs for the a given subject (row) – results of within-subject level tests. The gray color on the plots in the last row means significant reactive frequencies for the population. Dotted vertical lines at 8 Hz and 13 Hz mark the range of the -band. Note: For S6 in left column the blue line exceeds the shown range to reach the value of .</p

Test of magnitude of nSNR response for pairs of frequencies.

<p>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.</p