Perception of relation of stimuli locations successively flashed before saccade

Based on localization error for a single perisaccadic flash, eye position s ignal is supposed to change more slowly than physical eye position. Neverth eless, a flicker is not perceived as moving in accordance with localization error for a single flash. We carried out two experiments to investigate th is problem. Experiment 1 examined how a single flash or a flicker presented before saccade was perceived. The results showed that the flicker was not perceived as moving, although mislocalization for the single flash increase s gradually before saccade. Experiment 2 was a vernier test of two stimuli successively hashed before the saccade. The results showed that the point o f subjective equality shifted in accordance with the mislocalization for a single perisaccadic flash when the interstimulus interval (ISI) was about 2 s; however, it did not shift when the ISI was 78 ms. Comparison between th ese results and previous studies suggests that the relation of the location s of successive hashes before saccade is perceived exocentrically when the ISI and stimulus onset asynchrony between flashes was short. (C) 2001 Elsev ier Science Ltd. All rights reserved.