Summary of (a) error rate and (b) latency data extracted from previous studies.

<p>When precise values were not provided we estimated values from graphs. Since Cherkasova et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172485#pone.0172485.ref029" target="_blank">29</a>] did not include collapsed data for "interleaved" condition we used data from "switch" condition. In Wang et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172485#pone.0172485.ref040" target="_blank">40</a>] we sampled the "young" group. In Ansari et al. [<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0172485#pone.0172485.ref028" target="_blank">28</a>] we averaged data from high and low anxious individuals (since both represent a standard normal sample of college students).</p

Example of typical pro- and anti- saccade trial sequence.

<p>On the left, fixation instructs a generation of a pro-saccade (pro trial), first target appears on the right- a saccade to the right would be a "correct" response. Second target appears at the same (cued) location as first target, pressing the keyboard "up arrow" quickly would be a correct response. On the right, fixation instructs a generation of anti-saccade (anti trial), a saccade to the left would be a correct response, the second target is at the same (cued) location of the first target. The figure is not drawn to scale.</p

Mean <i>D</i>-scores calculated as <i>D = Anti-pro</i> latencies (<i>ms</i>) under block and interleaved conditions.

<p>Error bars represent the standard error of the mean. Dependent t-test was used for post-hoc comparison. ⁺<i>p</i><0.001.</p

Mean latency (<i>ms</i>) of correct saccades for pro-saccade and anti-saccade trials under block and randomly assigned conditions.

<p>Error bars represent the standard error of the mean. Simple effects were analyzed via Bonferroni post-hoc comparisons. ⁺<i>p</i><0.001.</p

Subject demographic and optometric details.

<p>Subject demographic and optometric details.</p

Bar graph of red-green interval.

<p>The X axis is subject number and Y axis is the interval between “red” and “green” responses in diopters. Blue is with spherical correction only; red is with spherical and cylindrical correction.</p