Discrepant integration times for upright and inverted faces

Arnold, Derek H. and Lipp, Ottmar V. (2011) Discrepant integration times for upright and inverted faces. Perception, 40 8: 989-999. doi:10.1068/p6955

Author Arnold, Derek H.
Lipp, Ottmar V.
Title Discrepant integration times for upright and inverted faces
Journal name Perception   Check publisher's open access policy
ISSN 0301-0066
Publication date 2011
Sub-type Article (original research)
DOI 10.1068/p6955
Open Access Status Not Open Access
Volume 40
Issue 8
Start page 989
End page 999
Total pages 11
Place of publication London, United Kingdom
Publisher Sage Publications
Collection year 2012
Language eng
Formatted abstract
Judgments of upright faces tend to be more rapid than judgments of inverted faces. This is consistent with encoding at different rates via discrepant mechanisms, or via a common mechanism that is more sensitive to upright input. However, to the best of our knowledge no previous study of facial coding speed has tried to equate sensitivity across the characteristics under investigation (eg emotional expression, facial gender, or facial orientation). Consequently we cannot tell whether different decision speeds result from mechanisms that accrue information at different rates, or because facial images can differ in the amount of information they make available. To address this, we examined temporal integration times, the times across which information is accrued toward a perceptual decision. We examined facial gender and emotional expressions. We first identified image pairs that could be differentiated on 80% of trials with protracted presentations (1 s). We then presented these images at a range of brief durations to determine how rapidly performance plateaued, which is indicative of integration time. For upright faces gender was associated with a protracted integration relative to expression judgments. This difference was eliminated by inversion, with both gender and expression judgments associated with a common, rapid, integration time. Overall, our data suggest that upright facial gender and expression are encoded via distinct processes and that inversion does not just result in impaired sensitivity. Rather, inversion caused gender judgments, which had been associated with a protracted integration, to become associated with a more rapid process.
Keyword Upside-down faces
Facial expressions
Lighting direction
Rapid extraction
Inversion leads
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Psychology Publications
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Citation counts: TR Web of Science Citation Count  Cited 3 times in Thomson Reuters Web of Science Article | Citations
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