Illumination-induced apparent shift in orientation of human Heads

Troje, Nikolaus F. and Siebeck, Ulrike (1998) Illumination-induced apparent shift in orientation of human Heads. Perception, 27 6: 671-680. doi:10.1068/p270671

Author Troje, Nikolaus F.
Siebeck, Ulrike
Title Illumination-induced apparent shift in orientation of human Heads
Journal name Perception   Check publisher's open access policy
ISSN 1468-4233
Publication date 1998
Sub-type Article (original research)
DOI 10.1068/p270671
Open Access Status Not Open Access
Volume 27
Issue 6
Start page 671
End page 680
Total pages 11
Place of publication London, United Kingdom
Publisher Sage Publications
Language eng
Abstract Changing the position of a light source illuminating a human face induces an apparent shift of the perceived orientation of that face. The direction of this apparent shift is opposite to the shift of the light source. We demonstrated the illumination-induced apparent orientation shift (IAOS), quantified it in terms of the physical orientation shift needed to compensate for it, and evaluated the results in the context of possible mechanisms underlying orientation judgment. Results indicate that IAOS depends not only on the angle between the two light source positions, but also on the mean orientation of the face. Availability of cues coded in the visual texture of the face did not affect IAOS. The most effective cue was the location of the visible outline of the face. IAOS seems to be due to a shift of this outline when shadowed areas on the face merge with the black background. We conclude that an important mechanism for orientation judgment is based on a comparison of visible parts left and right of the profile line.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biomedical Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 16 times in Thomson Reuters Web of Science Article | Citations
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Created: Mon, 15 Feb 2010, 13:35:35 EST by Laura McTaggart on behalf of Faculty of Science