Early responses to double-step targets are independent of step amplitude

We used a double-step paradigm to examine saccadic responses occurring at short intervals (50-150 ms) after the presentation of a 2-8 degrees step. Saccades occurring 60-110 ms after the second step had amplitudes independent of the step size. The amplitudes scaled to step size for intervals greater than 110 ms. These findings suggest that there is an early period of saccadic goal processing during which only information about the hemispheric location, but not the amplitude, of the target motion is available.