Fig. 1.

Summary of the conditions in all four experiments (experiment number indicated in pink). In Experiments 1–3 all conditions were randomly interleaved with the relative frequencies indicated in the top left corners of the graphical representations. In Experiment 4, the conditions within each of the four sessions (rows) were randomly interleaved with the indicated relative frequencies. All representations are drawn to scale. They are all drawn with the special target on the right (if present) and a schematic movement path to the right (black curve). The displays could actually be presented in any orientation with respect to the start of the movement path (the left end of the schematic movement paths in these images) and participants could move to any target. The open circles in Experiment 1 represent targets that disappeared after 200 ms (replacement conditions). Other details are explained in the specific methods sections