AI Article Synopsis
- In Helmholtz's illusion, a square with horizontal stripes is perceived as taller than one with vertical stripes, which contrasts with the belief that horizontal stripes make someone look wider.
- In recent experiments, a study revealed that horizontal stripes in clothing can create a thinning effect on the appearance of the body, especially when compared to clothing with no stripes, regardless of whether vertical stripes are present.
- The study found that both horizontal stripes and lower luminance independently contribute to this thinning perception, and the effect is amplified when both factors are combined, particularly in darker backgrounds.
Article Abstract
In Helmholtz's illusion, a square with horizontal stripes appears taller than an identical square with vertical stripes. This effect has also been observed in experiments with human stimuli, where a human figure wearing a dress with horizontal stripes appears thinner than a drawing clad in vertical stripes. These findings do not agree with the common belief that clothes with horizontal stripes make someone appear wider, neither do they disentangle whether the horizontal or vertical stripes account for the thinning effect. In the present study, we focused on the effect of horizontal stripes in clothes comparing horizontal stripes against no-stripes (not against vertical; Experiments 1 and 2), using photos of a real-life female model, and controlling for the average luminance of the stripes (Experiment 2). Results showed that horizontal stripes and lower luminance have-independently-a small-to-moderate thinning effect on the perceived size of the body, and the effect is larger when the two variables are combined. In Experiment 3, we further show that the thinning effect due to the luminance of the dress is enhanced when the general background gets darker.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8438770 | PMC |
| http://dx.doi.org/10.1177/03010066211038158 | DOI Listing |
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