Effect of Vertical Stretching on the Extraction of Mean Identity From Faces

Abstract

Article (Accepted Version) http://sro.sussex.ac.uk Hole, Graham and Bagaini, Alexandra (2017) The effect of vertical stretching on the extraction of mean identity from faces. This version is available from Sussex Research Online: http://sro.sussex.ac.uk/68803/ This document is made available in accordance with publisher policies and may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the URL above for details on accessing the published version. Copyright and reuse:Sussex Research Online is a digital repository of the research output of the University.Copyright and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable, the material made available in SRO has been checked for eligibility before being made available.Copies of full text items generally can be reproduced, displayed or performed and given to third parties in any format or medium for personal research or study, educational, or not-for-profit purposes without prior permission or charge, provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way.Effect of vertical stretching on the extraction of mean identity from faces: page Observers can extract the mean identity from a set of faces and falsely recognise it as a genuine set member (de Fockert & Wolfenstein, 2009). The current experiment demonstrated that this "perceptual averaging" also occurs with vertically stretched faces. On each trial, participants decided whether a target face was present in a preceding set of four faces. In the control condition, the faces were all normally proportioned; in the stretched set condition, the face sets were stretched but the targets were normal; and in the stretched target condition, the face sets were normal but the targets were stretched. In all three conditions, participants falsely identified the set mean as a face that had been presented within the set, implying that this identity-averaging effect is based on high-level identity information rather than the lowlevel physical characteristics of the face stimuli.

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“…A sequence of pairs of digitized faces is rapidly presented. The viewer is instructed to gaze on a midpoint between the two simultaneously presented faces (Bagaini & Hole, 2017;Tangen et al, 2011). Viewers describe the resulting faces as highly deformed and grotesque.…”