This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.ĭata Availability: The data can be accessed here. Received: MaAccepted: SeptemPublished: October 10, 2019Ĭopyright: © 2019 Yildiz et al. PLoS ONE 14(10):Įditor: Magdalena Ewa Król, SWPS University of Social Sciences and Humanities, POLAND However, the former seems to fulfil a more prominent role when both stimuli are presented in the image.Ĭitation: Yildiz GY, Sperandio I, Kettle C, Chouinard PA (2019) The contribution of linear perspective cues and texture gradients in the perceptual rescaling of stimuli inside a Ponzo illusion corridor.
We conclude that both top-down and bottom-up mechanisms play important roles. Nonetheless, additional maximum likelihood estimation analyses revealed that linear perspective fulfilled a greater contribution in experiment 2, which is suggestive of a bottom-up mechanism. These findings indicate that top-down mechanisms provide an important contribution to the Ponzo illusion. Additional eye-tracking revealed that participants tended to gaze more in the upper than the lower visual-field. Perceptual rescaling was also stronger for the top compared to the bottom ring. In both experiments, the effects of the cues were additive. The perceived size of the top but not the bottom ring changed as a function of the availability of linear perspective and textures. In experiment 2, only one ring was presented either at the top or the bottom of the image. The perceived size of the top and bottom rings changed as a function of the availability of linear perspective and textures. In experiment 1, one ring was presented in the upper visual-field at the end of the corridor and the other in the lower visual-field at the front of the corridor. We performed two experiments using the Method of Constant Stimuli where participants judged the size of one of two rings. We examined the influence of linear perspective cues and texture gradients in the perceptual rescaling of stimuli over a highly-salient Ponzo illusion of a corridor.
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