BIROn - Birkbeck Institutional Research Online

    The 20-item prosopagnosia index (PI20): a self-report instrument for identifying developmental prosopagnosia

    Shah, Punit and Gaule, A. and Sowden, S. and Bird, Geoffrey and Cook, Richard (2015) The 20-item prosopagnosia index (PI20): a self-report instrument for identifying developmental prosopagnosia. Royal Society Open Science , ISSN 2054-5703.

    [img] Text
    Shah et al (2015) PI20.pdf - Author's Accepted Manuscript
    Restricted to Repository staff only

    Download (451kB)
    [img]
    Preview
    Text
    21305.pdf - Published Version of Record
    Available under License Creative Commons Attribution.

    Download (587kB) | Preview

    Abstract

    Self-report plays a key role in the identification of developmental prosopagnosia (DP), providing complementary evidence to computer-based tests of face recognition ability, aiding interpretation of scores. However, the lack of standardized self-report instruments has contributed to heterogeneous reporting standards for self-report evidence in DP research. The lack of standardization prevents comparison across samples and limits investigation of the relationship between objective tests of face processing and self-report measures. To address these issues, this paper introduces the PI20; a 20-item self-report measure for quantifying prosopagnosic traits. The new instrument successfully distinguishes suspected prosopagnosics from typically developed adults. Strong correlations were also observed between PI20 scores and performance on objective tests of familiar and unfamiliar face recognition ability, confirming that people have the necessary insight into their own face recognition ability required by a self-report instrument. Importantly, PI20 scores did not correlate with recognition of non-face objects, indicating that the instrument measures face recognition, and not a general perceptual impairment. These results suggest that the PI20 can play a valuable role in identifying DP. A freely available self-report instrument will permit more effective description of self-report diagnostic evidence, thereby facilitating greater comparison of prosopagnosic samples, and more reliable classification.

    Metadata

    Item Type: Article
    School: Birkbeck Schools and Departments > School of Science > Psychological Sciences
    Depositing User: Richard Cook
    Date Deposited: 22 Feb 2018 09:35
    Last Modified: 15 Feb 2020 12:35
    URI: http://eprints.bbk.ac.uk/id/eprint/21305

    Statistics

    Downloads
    Activity Overview
    162Downloads
    91Hits

    Additional statistics are available via IRStats2.

    Archive Staff Only (login required)

    Edit/View Item Edit/View Item