Reaction times averaged for all participants.

<p>The data are plotted separately for the speed and penalty conditions. The reaction times are markedly longer on the first stimulus row, just after the stimulus is revealed. Towards stimulus end, the reaction times drop off, reflecting the reduced amount of computation required for planning action over the reducing number of remaining rows. The shaded blue and red regions represent the rows on which the number of rows to stimulus end is equal to participant’s estimated depths of computation, where the approaching stimulus end is expected to have an effect on reaction times. Indeed, the reaction times start to drop at about the predicted rows. The data are averages of log reaction times (since the data were highly skewed) and the error bars are bootstrapped 95% confidence intervals.