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  Aftereffects with faces: Evidence for prototype referenced encoding of identity

Leopold, D., Bondar, I., & Logothetis, N. (2003). Aftereffects with faces: Evidence for prototype referenced encoding of identity. In N. Elsner, & H. Zimmermann (Eds.), The Neurosciences from Basic Research to Therapy: Proceedings of the 29th Göttingen Neurobiology Conference and the 5th Meeting of the German Neuroscience Society 2003 (pp. 124). Stuttgart, Germany: Thieme.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-4513-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-77F7-F
Genre: Meeting Abstract

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 Creators:
Leopold, DA1, 2, Author              
Bondar, I1, 2, Author              
Logothetis, NK1, 2, 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, ou_1497794              

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 Abstract: We examined how the perception of face identity was influenced by prior exposure to a different face. We found that, following a few seconds of adaptation to one face, the identity of a second face was systematically misperceived. This identity aftereffect modulated perception in a manner consistent with a shift along a particular trajectory in multidimensional `face space'. This trajectory passed through the central tendency of all faces, and its direction thus defined a particular identity. The results suggested that the visual system considers the average prototype face to be a reference point in its representation of faces, and led us to speculate that neural decoding of faces is a fundamentally comparative process. Such a scheme might constitute a fast and economical storage strategy for the brain to contend with a myriad of very similar shapes. With the aim of investigating this hypothesis more directly by neurophysiological methods, we recently trained a monkey to perform the same task, again with human faces. We found that, while the monkey's identification thresholds were slightly higher than the mean threshold for humans, his perception was affected by adaptation in exactly the same way as that of the human subjects. Finally I will report our initial neurophysiological findings, obtained using implanted microelectrode bundles in the inferotemporal cortex.

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 Dates: 2003-06
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: -
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Title: 29th Göttingen Neurobiology Conference, 5th Meeting of the German Neuroscience Society 2003
Place of Event: Göttingen, Germany
Start-/End Date: 2003-06-12 - 2003-06-15

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Title: The Neurosciences from Basic Research to Therapy: Proceedings of the 29th Göttingen Neurobiology Conference and the 5th Meeting of the German Neuroscience Society 2003
Source Genre: Proceedings
 Creator(s):
Elsner, N, Editor
Zimmermann, H, Editor
Affiliations:
-
Publ. Info: Stuttgart, Germany : Thieme
Pages: - Volume / Issue: - Sequence Number: 5 Start / End Page: 124 Identifier: ISBN: 3-13-137351-2