Visual transients reveal the veridical position of a moving object.
The position of a moving object is often mislocalised in the direction of movement. At the input stage of visual processing, the position of a moving object should still be represented veridically, whereas it should become closer to the mislocalised position at a later processing stage responsible for positional judgment. Here, we show that visual transients expose the veridical position of a moving object represented in early visual areas. For example, when a ring is flashed on a moving bar, the part of the bar within the ring is perceived at the veridical position, whereas the part outside the ring is perceived to be ahead of the ring as in the flash-lag effect. Our observations suggest that a filling-in process is triggered at the edges of the flash. This indicates that, in early cortical areas, moving objects are still represented at their veridical positions, and the perceived location is determined by the higher visual areas.
Kanai
Ryota
R
Psychonomics Division, Helmholtz Research Institute, Utrecht University, Heidelberglaan 2, NL 3584 CS Utrecht, The Netherlands. r.kanai@fss.uu.nl
Verstraten
Frans A J
FA
D006801:Humans; D007600:Judgment; D008960:Models, Psychological; D009039:Motion Perception; D009903:Optical Illusions; D010775:Photic Stimulation / Q000379:methods; D011581:Psychological Tests; D013997:Time Factors