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Holistic face perception: Mind the gap!

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Rossion, Bruno [UCL] Retter, Talia L [UCL]

The most widely used measurement of holistic face perception, the composite face effect (CFE), is challenged by two apparently contradictory goals: having a defined face part (i.e., the top half), and yet perceiving the face as an integrated unit (i.e., holistically). Here, we investigated the impact of a small gap between top and bottom face halves in the standard composite face paradigm, requiring matching of sequentially presented top face halves. In Experiment 1, the CFE was larger for no-gap than gap stimuli overall, but not for participants who were presented with gap stimuli first, suggesting that the area of the top face half was unknown without a gap. This was confirmed in Experiment 2, in which these two stimulus sets were mixed up: the gap stimuli thus provided information about the area of a top face half and the magnitude of the CFE did not differ between stimulus sets. These observations indicate that the CFE might be artificially inflated in the absence of a stimulus cue that objectively defines a border between the face halves. Finally, in Experiment 3, observers were asked to determine which of two simultaneously presented faces was the composite face. Perceptual judgements for no-gap stimuli approached ceiling; however, with a gap, participants were almost unable to distinguish the composite face from a veridical face. This effect was not only due to low-level segmentation cues at the border of no-gap face halves, because stimulus inversion decreased performance in both conditions. This result indicates that the two halves of different faces may be integrated more naturally with a small gap that eliminates an enhanced contrast border. Collectively, these observations suggest that a small gap between face halves provides an objective definition of the face half to match and is beneficial for valid measurement of the behavioural CFE.

Document type Article de périodique (Journal article) – Article de recherche
Publication date 2015
Language Anglais
Journal information "Visual Cognition" - Vol. 23, no. 3, p. 379-398 (2015)
Peer reviewed yes
issn 1464-0716
e-issn 1464-0716
Publication status Publié
Affiliations UCL - SSH/IPSY - Psychological Sciences Research Institute
UCL - SSS/IONS - Institute of NeuroScience
UCL - SSS/IONS/COSY - Systems & cognitive Neuroscience
Links
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Bibliographic reference Rossion, Bruno ; Retter, Talia L. Holistic face perception: Mind the gap!. In: Visual Cognition, Vol. 23, no. 3, p. 379-398 (2015)
Permanent URL http://hdl.handle.net/2078.1/162542