(A) Schematic illustration of a context trial. A full-field grating was presented throughout the entire trial. A trial started with the presentation of a fixation point. After 1000–1500 ms a saccade target was presented together with the fixation point for 60 ms. Then, both, the saccade target and the fixation point disappeared. Subjects were instructed to perform a saccade to the remembered position of the saccade target as soon as the fixation point disappeared. Depending on the session, the grating was displaced upwards after 35, 98, 187 ms or not displaced at all. (B) Time-course of events in the context trials for the fixation point (FP), the saccade target (ST), the seven horizontal eye position (H EP) and the grating displacement (Motion). (C,D) Example eye velocity profiles from one participant representing saccade performance in the context trials (shown in blue). Average eye position is shown by the blue line. Average timing of the actual grating displacement is shown by the red vertical line and the standard deviation of the timing by the shaded area. (E) Summary of conditions. Baseline sessions consisted only of test trials. The remaining four sessions contained context and test trials. In these sessions the grating was displaced 35, 98, 187 ms after saccade execution or not displaced at all. (F) Schematic illustration of a displacement discrimination trial. These trials were identical to the context trials except that the grating was shifted upwards or downwards (indicated by the orange arrows) by various displacement sizes and across trials at various times relative to saccade onset. Participants were instructed to report the displacement direction at the end of the trial by pressing the corresponding arrow key on the computer keyboard. (G,H) Psychometric functions for judgements of the displacement direction in the test trials for all observers. Data in gray represent discrimination performance for grating displacements that occurred outside the saccade execution period and colored data peri-saccadic discrimination. Data in purple derive from sessions in which the grating displacement occurred 35 ms after saccade initiation in the context trials and data in orange from sessions with no grating displacement in the context trials. Discrimination performance was quantified by the JND of the psychometric function.