BIROn - Birkbeck Institutional Research Online

    Finger posture modulates structural body representations

    Tamè, Luigi and Dransfield, E. and Quettier, T. and Longo, Matthew R. (2017) Finger posture modulates structural body representations. Scientific Reports 7 , p. 43019. ISSN 2045-2322.

    [img] Text
    17960.pdf - Author's Accepted Manuscript
    Restricted to Repository staff only

    Download (901kB)
    17960A.pdf - Published Version of Record
    Available under License Creative Commons Attribution.

    Download (708kB) | Preview


    Patients with lesions of the left posterior parietal cortex commonly fail in identifying their fingers, a condition known as finger agnosia, yet are relatively unimpaired in sensation and skilled action. Such dissociations have traditionally been interpreted as evidence that structural body representations (BSR), such as the body structural description, are distinct from sensorimotor representations, such as the body schema. We investigated whether performance on tasks commonly used to assess finger agnosia is modulated by changes in hand posture. We used the ‘in between’ test in which participants estimate the number of unstimulated fingers between two touched fingers or a localization task in which participants judge which two fingers were stimulated. Across blocks, the fingers were placed in three levels of splay. Judged finger numerosity was analysed, in Exp. 1 by direct report and in Exp. 2 as the actual number of fingers between the fingers named. In both experiments, judgments were greater when non-adjacent stimulated fingers were positioned far apart compared to when they were close together or touching, whereas judgements were unaltered when adjacent fingers were stimulated. This demonstrates that BSRs are not fixed, but are modulated by the real-time physical distances between body parts.


    Item Type: Article
    School: School of Science > Psychological Sciences
    Depositing User: Matthew Longo
    Date Deposited: 01 Feb 2017 16:15
    Last Modified: 13 Jun 2021 03:14


    Activity Overview

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item