Difference waves for contour minus no-contour conditions.

<p>The graphs are obtained by subtracting the no-contour conditions (dotted lines in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0025151#pone-0025151-g003" target="_blank">Figure 3</a>) from the contour conditions (full lines in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0025151#pone-0025151-g003" target="_blank">Figure 3</a>).</p

Summary of the repeated-measures ANOVAs on the mean amplitudes and peak latencies for the P1, N1, and P2 components.

<p>Summary of the repeated-measures ANOVAs on the mean amplitudes and peak latencies for the P1, N1, and P2 components.</p

Example stimuli for the different array types.

<p>By rotating the elements of the contour condition (left column), the embedded contour perceptually disappears (middle column). Top row: Iso-oriented array, in which all elements surrounding the contour have the same orientation. Bottom row: Randomly-oriented array, in which the surrounding elements have a random orientation. Catch trials (right column) consist of the same stimuli with a small circle overlaid at a random location (here only illustrated for no-contour stimuli). Catch trials are not included in the analyses.</p

Electrodes of interest.

<p>(a) Topographic maps representing the temporal evolution of the difference between the contour and the no-contour conditions (aggregated over iso-oriented and randomly-oriented displays). The electrodes in the significant cluster are highlighted. (b) Spatial layout of the 15 electrodes of interest, with their corresponding labels.</p

Condition-specific grand average ERPs.

<p>Grand mean ERPs (n = 12), averaged over the 15 electrodes of interest (<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0025151#pone-0025151-g002" target="_blank">Figure 2b</a>). Full lines represent conditions with an embedded contour; dotted lines represent conditions without an embedded contour. Blue: Iso-oriented conditions. Red: Randomly-oriented conditions.</p