Showing papers by "Stuart Anstis published in 2022"
TL;DR: In this paper , the authors explore the role of frame continuity and grouping of the flashes with the frame in generating the frame effect and find that the effect holds for smoothly or abruptly displacing frames, even when the frame changed shape or orientation between the endpoints of its travel.
Abstract: Probes flashed within a moving frame are dramatically displaced (Özkan et al, 2021; Wong &Mack, 1981). The effect is much larger than that seen on static or moving probes (induced motion, Duncker, 1929; Wallach et al, 1978). These flashed probes are often perceived with the separation they have in frame coordinates — a 100% effect. Here we explore this frame effect on flashed tests with several versions of the standard stimulus. We find that the frame effect holds for smoothly or abruptly displacing frames, even when the frame changed shape or orientation between the endpoints of its travel. The path could be non-linear, even circular. The effect was driven by perceived not physical motion. When there were competing overlapping frames, the effect was determined by which frame was attended. There were a number of constraints that limited the effect. A static anchor near the flashes suppressed the effect but an extended static texture did not. If the probes were continuous rather than flashed, the effect was abolished. The observational reports of 30 online participants suggest that the frame effect is robust to many variations in its shape and path and leads to a perception of flashed tests in their locations relative to the frame as if the frame were stationary. Our results highlight the role of frame continuity and of the grouping of the flashes with the frame in generating the frame effect.
4 citations
TL;DR: In this article , the authors presented a Front.Psychol. Psychol., 07 February 2022Sec. 12 - 2021 | https://doi.org/10.3389/fpsyg.2021.817745
Abstract: OPINION article Front. Psychol., 07 February 2022Sec. Perception Science Volume 12 - 2021 | https://doi.org/10.3389/fpsyg.2021.817745
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TL;DR: In this paper , a white test disk is embedded in a surround that alternates, in either space or time, between red and white, but it does not look green, it looks pink.
Abstract: A white test disk is embedded in a surround that alternates, in either space or time, between red and white. Simultaneous contrast should make the disk look green, but it does not. It looks pink.
TL;DR: In this article , two versions of the flash grab illusion were used to examine the relative contributions of motion before and motion after the test flash to the illusory position shift, and the results showed a significant increase in illusion strength with the duration of pre-flash motion and the effect of the pre flash motion was almost 50% that of the post flash motion.
Abstract: Two versions of the flash grab illusion were used to examine the relative contributions of motion before and motion after the test flash to the illusory position shift. The stimulus in the first two experiments was a square pattern that expanded and contracted with an outline square flashed each time the motion reversed producing a dramatic difference in perceived size between the two reversals. Experiment 1 showed a strong illusion when motion was present before and after the flashed tests or just after the flashes, but no significant effect when only the pre-flash motion was present. In Experiment 2, motion always followed the flash, and the duration of the pre-flash motion was varied. The results showed a significant increase in illusion strength with the duration of pre-flash motion and the effect of the pre-flash motion was almost 50% that of the post-flash motion. Finally, Experiment 3 tested the position shifts when the linear motion of a disk before the flash was orthogonal to its motion after the flash. Here, the results again showed that the pre-flash motion made a significant contribution, about 32% that of the post-flash motion. Several models are considered and even though all fail to some degree, they do offer insights into the nature of the illusion. Finally, we show that the empirical measure of the relative contribution of motion before and after the flash can be used to distinguish the mechanisms underlying different illusions.