University of Wollongong Research Online Faculty of Health and Behavioural Sciences - Papers (Archive) Faculty of Science, Medicine and Health 1-1-2010 How different is different? Investigating criteria for different identity judgments Harold C. Hill University of Wollongong, [email protected] Michelle Corcoran [email protected] Peter Claes John Clement The University Of Melbourne Follow this and additional works at: https://ro.uow.edu.au/hbspapers Part of the Arts and Humanities Commons, Life Sciences Commons, Medicine and Health Sciences Commons, and the Social and Behavioral Sciences Commons Recommended Citation Hill, Harold C.; Corcoran, Michelle; Claes, Peter; and Clement, John: How different is different? Investigating criteria for different identity judgments 2010, 156-156. https://ro.uow.edu.au/hbspapers/987 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] How different is different? Investigating criteria for different identity judgments Abstract Any face seen for the first time will have a closet neighbour in memory. In order to avoid false alarms, we must be able to distinguish similar from identical faces. Work is reported investigating same/different judgments as a function difference in three dimensional shape defined in terms of standard deviation in a principal component based face space. The aim is to determine the criterion difference below which observers respond “same”. A threshold corresponding to a dprime of 1 was also calculated. Both were first measured under three conditions – same view images, different view images and animated images of the faces rotating. Criterion did not differ significantly between presentation conditions and the mean criterion corresponded to 0.45 SD when the average face was used as the reference. Threshold did differ significantly between conditions, and was significantly higher for different view faces (.65SD) than for same view (.39SD) or animated faces (.44SD). The results are interpreted as indicating that the criterion for same/different judgements is relatively stable across presentation conditions, but that sensitivity is lower when making the judgement across a change in view. Further work will investigate whether criterion varies as a function of distinctiveness. Keywords different, judgments, investigating, criteria, identity Disciplines Arts and Humanities | Life Sciences | Medicine and Health Sciences | Social and Behavioral Sciences Publication Details Hill, HC, Corcoran, M, Claes, P & Clement, J, How different is different? Investigating criteria for different identity judgments, In ECVP'10: 33rd European Conference on Visual Perception, 22 August, Lausanne, Switzerland. Perception, 39(Abstract Supplement), 2010, p 156. This conference paper is available at Research Online: https://ro.uow.edu.au/hbspapers/987 ____ ___ _ ____ ____ __ ______ __________ ______ __ ______ _________ ______________________ Perception, 2010, volume 39, supplement, page 1 – 203 Thirty-third European Conference on Visual Perception Lausanne, Switzerland 22 – 26 August 2010 Abstracts Sunday Symposium in honour of the late Richard Gregory 1 Perception Lecture (C Koch) 3 Monday Talks: Attention 4 Talks: Adaptation, Brightness and Contrast 6 Symposium: Face perception in man and monkey 9 Talks: Objects 10 Symposium: Colour appearance mechanisms 12 Talks: Neural mechanisms 14 Posters: Applied vision 16 Posters: Biological motion 18 Posters: Clinical vision and ageing 20 Posters: Contours and crowding 25 Posters: Emotions and cognition 30 Posters: Eye movements I 33 Posters: Learning and memory 38 Posters: Models and theory 44 Posters: Non-human vision 49 Posters: Perception and action I 50 Tuesday Talks: Eye movements 55 Talks: Clinical vision 57 Talks: Spatial vision 60 Talks: Learning and memory 62 Symposium: Visual social perception: Brain imaging and sex differences 64 Talks: Multisensory processing and haptics 66 Rank Lecture 68 Posters: 3D vision, depth I 68 Posters: Adaptation, aftereffects 74 Posters: Attention I 78 Posters: Colour 84 Posters: Face perception I 89 Posters: Motion I 94 Posters: Natural images 99 Posters: Objects and scenes 101 Wednesday Talks: 3D Vision, depth 107 Symposium: The complexity of visual stability 110 Symposium: Psychophysics: yesterday, today, and tomorrow 112 Posters: Art and vision 113 Posters: Attention II 117 Posters: Consciousness and rivalry 123 Posters: Face perception II 125 Posters: Haptics 130 Posters: Imaging 133 Posters: Motion II 137 Posters: Multisensory processing 142 Posters: Reading 147 Thursday Talks: Motion 150 Talks: Multistability, rivalry 152 Talks: Face perception 155 Talks: Colour 157 Posters: 3D Vision, depth II 160 Posters: Brightness, lightness 165 Posters: Contrast 168 Posters: Eye movements II 170 Posters: Illusions 174 Posters: Perception and action II 180 Posters: Perceptual organization 184 Posters: Temporal processing 187 Posters: Visual search 191 Publisher’s note. In the interests of efficiency, these abstracts have been reproduced as supplied by the Conference with little or no copy editing by Pion. Thus, the English and style may not match those of regular Perception articles. Organiser Michael Herzog Local Committee Gijs Plomp Laure Dayer Silvia Marchesotti Val ´ erie Jacot-Descombes Marc Repnow Scientific Committee Talis Bachmann Anton Beer Eli Brenner Emanuela Bricolo Anna Brooks Isabelle B¨ ulthoff Claus-Christian Carbon Patrick Cavanagh Heiner Deubel Casper Erkelens Manfred Fahle Jozsef Fiser Sergei Gepshtein Tandra Ghose Alan Gilchrist Mark W. Greenlee Elisabeth Hein Sven Heinrich Frouke Hermens Robert Hess Todd Horowitz Anya Hurlbert Alumit Ishai Astrid Kappers Dirk Kerzel Akiyoshi Kitaoka Joseph Krummenacher G¨unter Meinhardt Marino Menozzi Michael Morgan Thomas Papathomas Galina Paramei Baingio Pinna Gregor Rainer Brian Rogers Bettina Rolke Takao Sato Thomas Schmidt Robert O’Shea Claudio de’Sperati Hans Strasburger Ian Thornton Simon Thorpe Frans Verstraten Thomas Wachtler Johan Wagemans Andrew Watson Sophie Wuerger Qasim Zaidi Johannes Zanker Li Zhaoping Supporting organisations Canton de Vaud (www.vd.ch) Cooperation@epfl (cooperation.epfl.ch) ECVP 2008 (www.fss.uu.nl/psn/web/people/projects/ECVP2008/) ECVP 2009 (www.ecvp2009.org) F. Hoffmann-La Roche AG (www.roche.ch) Merck Serono SA (www.merckserono.net) Novartis Pharma AG (www.novartis.ch) Optical Society of America (www.osa.org) Pion Ltd (www.pion.co.uk) Swiss National Science Foundation (SNSF) (www.snf.ch) The City of Lausanne (www.lausanne.ch) The Rank Prize Funds (www.rankprize.org) The European Conference on Visual Perception is an annual event. Previous conferences took place in: 1978 Marburg (D) 1979 Noordwijkerhout (NL) 1980 Brighton (GB) 1981 Gouvieux (F) 1982 Leuven (B) 1983 Lucca (I) 1984 Cambridge (GB) 1985 Pe˜ niscola (E) 1986 Bad Nauheim (D) 1987 Varna (BG) 1988 Bristol (GB) 1989 Zichron Yaakov (IL) 1990 Paris (F) 1994 Eindhoven (NL) 1995 T¨ubingen (D) 1996 Strasbourg (F) 1997 Helsinki (FI) 1998 Oxford (GB) 1999 Trieste (I) 2000 Groningen (NL) 2001 Kus¸adasi (TR) 2002 Glasgow (GB) 2003 Paris (F) 2004 Budapest (H) 2005 A Coru˜na (E) 2006 St Petersburg (RU) 2007 Arezzo (I) 2008 Utrecht (NL) 2009 Regensburg (D) © Copyright 2010 a Pion publication printed in Great Britain Symposium in honour of the late Richard Gregory Sunday 1 ECVP 2010 Abstracts Sunday SYMPOSIUM IN HONOUR OF THE LATE RICHARD GREGORY m Richard and randomness drove my research S Anstis (University of California, San Diego (UCSD), USA; e-mail: [email protected]) In the mid-20th century, Richard was working on motion perception, so I, his first graduate student, did likewise. First, using a rotating kymograph drum, a xerox of Bela Julesz’ first random-dot patterns, and a stroboscope, I failed to discover Dmax . (Ol Braddick succeeded in discovering that later.) Then, using some fluorescent tubes driven by a home-made power pack, I failed to make a power stroboscope, but I stumbled across a ramp aftere_ect, which I published in Science. Encouraged, but only faintly, by Richard, I discovered reversed phi by putting the wrong slides into a projector. Inspired by Richard’s declaring that my PhD. thesis was ‘surprisingly good’, I went on to stumble across the footsteps illusion, the chopsticks illusion, four-stroke cycle motion, crossover motion, zigzag motion; and I have been stumbling on ever since. Richard has helped me to demonstrate that fortune favours the prepared mind (Pasteur) and also the unprepared mind (Anstis). Thank you, Richard. m All jazzy. Gregorian explorations of pure colour P Cavanagh (Université Paris Descartes, France; e-mail: [email protected]) Like many of us, I was captured, enthralled, and enslaved by Richard Gregory the first time I heard him speak. He showed us how faces melt into indecipherable islands of colour when presented at ‘isoluminance’. Inspired by Richard’s flapping eyebrows, his big smile and a laugh that boasted of the fun of vision research, I joined legions of others abandoning their plodding first careers and became a vision scientist. Richard had shown us how to use filters in front of a slide projector to adjust the red to green luminance and find the treasured ‘Critical Zone’ of equal luminance, where all turned to jelly, uncovering after 60 years the pioneering Gestalt discoveries of perceptual losses and the slowing of motion. For Richard’s Gregory Fest in Bristol, we built Big Chroma, the world’s largest equiluminant