Target selection task for arm reaching and for saccades. A, Subpanels show the single target task (SL, SR) and choice task (CL, CR) with selection of the left and right target. T, Target. Both tasks were presented for arm reaching (targets illuminated in green) or saccade movements (targets illuminated in red). B, Possible target orientations (I–IV) around an FP (middle). C, Reach board with 15 response buttons (circles) including three FPs (bold circles). D, SOA adaptation (PEST) during a block of 40 choice trials. Past leftward and rightward selections determine the future SOA. Horizontal line, BTD as determined in E. E, Psychometric function (black curve), fitting choice probability against SOA. Histogram, Distribution of rightward selections. Dots, SOA of individual leftward (at bottom) and rightward selections (at top). Dark vertical line, BTD.