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Alison Campbell, James Tanaka; Testing the face-specificity of the inversion effect in budgie experts . Journal of Vision 2014;14(10):816. doi: 10.1167/14.10.816.
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© ARVO (1962-2015); The Authors (2016-present)
Dramatic inversion costs in the recognition and perception of faces but not objects have reinforced the view that face-specific mechanisms support holistic processing for face individuation. The alternative expertise hypothesis asserts that these effects, while appearing face-selective, reflect domain-general processing strategies for expert perceptual discrimination. Previous studies of real-world object expertise have been restricted to the context of within-class object discrimination (e.g. car model, bird and dog species), providing a weak test of the expertise hypothesis with respect to perceptual individuation. In this study, we examined a novel form of expertise in bird breeders who individuate highly homogenous birds at the identity level. Breeders of show budgies maintain aviaries of 50-300 birds with each bird being uniquely recognized based on physical characteristics such as markings and body structure. Information about each bird's relation to the social and genetic structure of the bird group is also attached to this recognition. Performance in a sequential matching task for upright and inverted birds and faces was compared across experts and novices. Results show that budgie experts outperform bird novices in the perception of upright bird images, yet this increased perceptual ability is orientation specific and is impaired for inverted bird images. These results demonstrate that inversion effects can be found for objects which are individuated and visually homogenous, and support the hypothesis that inversion costs for faces are a consequence of domain-specific experience and not necessarily due to a face-specific mechanism.
Meeting abstract presented at VSS 2014
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