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Abstract

Prolonged visual exposure, or ‘adaptation’, to thin (wide) bodies causes a perceptual aftereffect such that subsequently seen bodies appear wider (thinner) than they actually are. Here, we conducted two experiments investigating the effect of rotating the orientation of the test stimuli by 90° from that of the adaptor. Aftereffects were maximal when adapting and test bodies had the same orientation. When they differed, the axis of the perceived distortion changed with the orientation of the body. Experiment 1 demonstrated a 58% transfer of the aftereffect across orientations. Experiment 2 demonstrated an even greater degree of aftereffect transfer when the influence of low-level mechanisms was reduced further by using adaptation and test stimuli with different sizes. These results indicate that the body aftereffect is mediated primarily by high-level object-based processes, with low-level retinotopic mechanisms playing only a minor role. The influence of these low-level processes is further reduced when test stimuli differ in size from adaptation stimuli.

Item Type:	Article
Authors/Creators:	Brooks, KR and Clifford, CWG and Stevenson, RJ and Mond, J and Stephen, ID
Keywords:	adaptation; aftereffects; body size and shape misperception; high level; low level
Journal or Publication Title:	Royal Society Open Science
Publisher:	The Royal Society Publishing
ISSN:	2054-5703
DOI / ID Number:	https://doi.org/10.1098/rsos.172103
Copyright Information:	Copyright 2018 The AuthorsLicensed under Creative Commons Attribution 4.0 International (CC BY 4.0)https://creativecommons.org/licenses/by/4.0/
Related URLs:	Google Scholar: Mond, J
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