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Perception and Recognition of Normal and Negative Faces: The Role of Shape from Shading and Pigmentation Cues

Perception and Recognition of Normal and Negative Faces: The Role of Shape from Shading and... A face is surprisingly difficult to recognise when presented in photographic negative, and negation has also been shown to affect simple perceptual judgments about a face. Two possible explanations for this effect are examined. In the shape-from-shading explanation it is argued that negating an image results in an impossible pattern of shading, and that this disrupts the formation of a three-dimensional representation of the surface geometry of the face. In an alternative account for this effect it is suggested that identification errors occur as a consequence of changes to the apparent pigmentation of the face caused by negating the image. Three experiments are reported which are designed to test these explanations by using novel colour-image transformations in which the hue and luminance components of images are independently manipulated. The results of these studies suggest that although changes to the apparent pigmentation of a face might result in identification errors in some situations, the loss of shape-from-shading cues is a more important cause of the negation effect. The role of these two sources of information in the recognition of normal faces is also discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Perception SAGE

Perception and Recognition of Normal and Negative Faces: The Role of Shape from Shading and Pigmentation Cues

Kemp, Richard; Pike, Graham; White, Peter; Musselman, Alex
Perception , Volume 25 (1): 16 – Jan 1, 1996
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References (23)

Publisher
SAGE
Copyright
© 1996 SAGE Publications
ISSN
0301-0066
eISSN
1468-4233
DOI
10.1068/p250037
pmid
8861169
Publisher site
See Article on Publisher Site

Abstract

A face is surprisingly difficult to recognise when presented in photographic negative, and negation has also been shown to affect simple perceptual judgments about a face. Two possible explanations for this effect are examined. In the shape-from-shading explanation it is argued that negating an image results in an impossible pattern of shading, and that this disrupts the formation of a three-dimensional representation of the surface geometry of the face. In an alternative account for this effect it is suggested that identification errors occur as a consequence of changes to the apparent pigmentation of the face caused by negating the image. Three experiments are reported which are designed to test these explanations by using novel colour-image transformations in which the hue and luminance components of images are independently manipulated. The results of these studies suggest that although changes to the apparent pigmentation of a face might result in identification errors in some situations, the loss of shape-from-shading cues is a more important cause of the negation effect. The role of these two sources of information in the recognition of normal faces is also discussed.

Journal

Perception – SAGE

Published: Jan 1, 1996

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