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Probing the effect of the expected-speed violation illusion.
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- Author(s): Battaglini, Luca1 (AUTHOR); Mioni, Giovanna1 (AUTHOR); Casco, Clara1 (AUTHOR); Contemori, Giulio1,2 (AUTHOR); Konishi, Mahiko3 (AUTHOR)
- Source:
Psychological Research. Oct2021, Vol. 85 Issue 7, p2782-2791. 10p. 1 Black and White Photograph, 3 Diagrams, 1 Chart, 2 Graphs.- Subject Terms:
- Source:
- Additional Information
- Abstract: Motion perception is complex for the brain to process, involving interacting computations of distance, time, and speed. These computations can be biased by the context and the features of the perceived moving object, giving rise to several types of motion illusions. Recent research has shown that, in addition to object features and context, lifelong priors can bias attributes of perception. In the present work, we investigated if such long acquired expectations can bias speed perception. Using a two-interval forced-choice (2-IFC) task, we asked 160 participants in different experiments to judge which of two vehicles, one archetypically fast (e.g. a motorbike), and one comparatively slower (e.g. a bike), was faster. By varying the objective speeds of the two-vehicle types, and measuring the participants' point of subjective equality, we observed a consistent bias in participants' speed perception. Counterintuitively, in the first three experiments the speed of an archetypically slow vehicle had to be decreased relative to that of an archetypically fast vehicle, for the two to be judged as the same. Similarly, in the next three experiments, an archetypically fast vehicle's speed had to be increased relative to an archetypically slow vehicle's speed, for the two to be perceived as equal. Four additional control experiments replicated our results. We define this newly found bias as the expected-speed violation illusion (ESVI). We believe the ESVI as conceptually very similar to the size-weight illusion, and discuss it within the Bayesian framework of human perception. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Psychological Research is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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