Volume 9, Number 6, Article 7, Pages 1-13 doi:10.1167/9.6.7 http://journalofvision.org/9/6/7/ ISSN 1534-7362
The temporal advantage for individuating objects of expertise: Perceptual expertise is an early riser
Kim M. Curby
Department of Psychology, Temple University, Philadelphia, PA, USA
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Isabel Gauthier
Department of Psychology, Vanderbilt University, Nashville, TN, USA
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Abstract

The identification of faces has a temporal advantage over that of other object categories. The orientation-specific nature of this advantage suggests that it stems from our extensive experience and resulting expertise with upright faces. While experts can identify objects faster than novices, it is unclear exactly how the temporal dynamics of identification are changed by expertise and whether the nature of this temporal advantage is similar for face and non-face objects of expertise. Here, we titrated encoding time using a backward-masking paradigm with variable stimulus-mask onset-asynchronies and mapped the resulting effect on recognition for upright and inverted faces (Experiment 1) and for cars among car experts and car novices (Experiment 2). Performance for upright faces and cars among car experts rose above chance between 33 and 70 ms before that for inverted faces or cars among car novices. A shifted exponential function fitted to these data suggested that performance started to rise earlier for experts than for novices, but that additional encoding time increased performance at a similar rate. Experience influences the availability of information early in processing, possibly through the recruitment of more category-selective neurons, while the rate of perceptual processing may be less flexible and limited by inherent physiological constraints.

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History
Received November 3, 2008; published June 10, 2009
Citation
Curby, K. M., & Gauthier, I. (2009). The temporal advantage for individuating objects of expertise: Perceptual expertise is an early riser. Journal of Vision, 9(6):7, 1-13, http://journalofvision.org/9/6/7/, doi:10.1167/9.6.7.
Keywords
perceptual expertise, face processing, object processing, temporal dynamics
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