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    Perceptual distortions of 3-D finger size

    Tavacioglu, E.E. and Azanon Gracia, Elena and Longo, Matthew R. (2019) Perceptual distortions of 3-D finger size. Perception 48 (8), pp. 668-684. ISSN 0301-0066.

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    Our body is a volumetric, 3-dimensional object in the world, and we experience it as such. Existing methods for measuring the perceptual body image, however, have been based on judgments of 1-dimensional length or 2-dimensional images. We developed a new approach to the 3-D perceptual body image of the fingers by asking people to judge whether each finger would fit through rings of varying diameter. This task requires participants to conceptualize their finger as a volumetric object entering the ring. In two experiments, we used an adaptive staircase procedure to estimate the perceived size of each finger. There were systematic distortions of perceived 3-D finger size, with the size of index finger and (to a lesser extent) the middle finger underestimated. These distortions were unaffected by changes in hand posture. Notably, the pattern of distortions is qualitatively different from that found in previous research investigating 1-D finger length, suggesting that 3-D judgments of the body may differ in fundamental ways from 1-D judgments of individual body dimensions.


    Item Type: Article
    School: Birkbeck Faculties and Schools > Faculty of Science > School of Psychological Sciences
    Depositing User: Matthew Longo
    Date Deposited: 22 May 2019 15:25
    Last Modified: 02 Aug 2023 17:51


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