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  Prototype-referenced shape perception : Adaptation and after-effects in a multidimensional face space

O'Toole, A., Leopold, D., Vetter, T., & Blanz, V. (2001). Prototype-referenced shape perception: Adaptation and after-effects in a multidimensional face space. Poster presented at First Annual Meeting of the Vision Sciences Society (VSS 2001), Sarasota, FL, USA.

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O'Toole, AJ, Author              
Leopold, DA1, 2, Author              
Vetter, T, Author              
Blanz, V, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

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 Abstract: Prototype referenced adaptation effects were found among face stimuli in a computationally derived multidimensional face space based on a 3D morphing algorithm. Individual faces can be described as points or vectors in this space. An “identity trajectory” connecting a face to the average of all faces, defines a gradient of face individuality. Anti-caricatures lie along the “identity” trajectory between an individual face and the average face. “Anti-faces” lie along this trajectory, but on the “other side of the mean”. While anti-caricatures look like less distinctive versions of the original face, anti-faces have the appearance of an entirely different individual. For example, faces with light complexions and light eyes yield anti-faces with dark complexions and dark eyes, and faces with roundish shapes yield anti-faces with a gaunt, skinny appearance. We found that pre-exposure to an “anti-face”, specifically facilitated the identification of briefly presented anti-caricatures along the same trajectory, while diminishing performance for other non-colinear faces. The perceptual bias following anti-face adaptation was strong enough to cause systematic mislabeling of the average face as the face complement to the pre-exposed anti-face. Additional experiments showed that the adaptation effect survived a range of translations in size and retinal location between pre-exposure and test. Combined, the results suggest that the subordinate perception and recognition of faces, and perhaps other objects, may draw upon contrastive neural mechanisms that reference the central tendency of the stimulus category.

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 Dates: 2001-12
 Publication Status: Published in print
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 Identifiers: DOI: 10.1167/1.3.332
BibTex Citekey: O039TooleLVB2001
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Title: First Annual Meeting of the Vision Sciences Society (VSS 2001)
Place of Event: Sarasota, FL, USA
Start-/End Date: 2001-05

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Title: Journal of Vision
Source Genre: Journal
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Publ. Info: Charlottesville, VA : Scholar One, Inc.
Pages: - Volume / Issue: 1 (3) Sequence Number: - Start / End Page: 332 Identifier: ISSN: 1534-7362
CoNE: https://pure.mpg.de/cone/journals/resource/111061245811050