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The Thatcher illusion in humans and monkeys

Authors
Dahl, Christoph D.Logothetis, Nikos K.Buelthoff, Heinrich H.Wallraven, Christian
Issue Date
7-10월-2010
Publisher
ROYAL SOC
Keywords
Thatcher illusion; monkey; face recognition; holistic perception
Citation
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES, v.277, no.1696, pp.2973 - 2981
Indexed
SCIE
SCOPUS
Journal Title
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
Volume
277
Number
1696
Start Page
2973
End Page
2981
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/115527
DOI
10.1098/rspb.2010.0438
ISSN
0962-8452
Abstract
Primates possess the remarkable ability to differentiate faces of group members and to extract relevant information about the individual directly from the face. Recognition of conspecific faces is achieved by means of holistic processing, i.e. the processing of the face as an unparsed, perceptual whole, rather than as the collection of independent features (part-based processing). The most striking example of holistic processing is the Thatcher illusion. Local changes in facial features are hardly noticeable when the whole face is inverted (rotated 180 degrees), but strikingly grotesque when the face is upright. This effect can be explained by a lack of processing capabilities for locally rotated facial features when the face is turned upside down. Recently, a Thatcher illusion was described in the macaque monkey analogous to that known from human investigations. Using a habituation paradigm combined with eye tracking, we address the critical follow-up questions raised in the aforementioned study to show the Thatcher illusion as a function of the observer's species (humans and macaques), the stimulus' species (humans and macaques) and the level of perceptual expertise (novice, expert).
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