English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Meeting Abstract

Aftereffects with faces: Evidence for prototype referenced encoding of identity

MPS-Authors
/persons/resource/persons84050

Leopold,  DA
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons83820

Bondar,  I
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

/persons/resource/persons84063

Logothetis,  NK
Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society;
Max Planck Institute for Biological Cybernetics, Max Planck Society;

Fulltext (public)
There are no public fulltexts stored in PuRe
Supplementary Material (public)
There is no public supplementary material available
Citation

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.


Cite as: http://hdl.handle.net/21.11116/0000-0005-4513-8
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.