Target detection performance with randomised colour and luminance of the contour elements.

<p>Target detection rate as the function of target contrast. The target was embedded in predictable predictor-target sequence, but the colour and contrast of the adjacent bars was systematically varied (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0098268#s2" target="_blank">methods</a>). Error bars represent the standard error of mean.