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The role of configurality in the Thatcher illusion: an ERP study.

Mestry, N., Menneer, T., Wenger, M.J., Benikos, N., McCarthy, R.A. and Donnelly, N., 2015. The role of configurality in the Thatcher illusion: an ERP study. Psychonomic Bulletin & Review, 22 (2), 445 - 452.

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Mestry, Menneer, Wenger, Benikos, McCarthy, & Donnelly (2015).pdf - Published Version
Available under License Creative Commons Attribution.


DOI: 10.3758/s13423-014-0705-3


The Thatcher illusion (Thompson in Perception, 9, 483-484, 1980) is often explained as resulting from recognising a distortion of configural information when 'Thatcherised' faces are upright but not when inverted. However, recent behavioural studies suggest that there is an absence of perceptual configurality in upright Thatcherised faces (Donnelly et al. in Attention, Perception & Psychophysics, 74, 1475-1487, 2012) and both perceptual and decisional sources of configurality in behavioural tasks with Thatcherised stimuli (Mestry, Menneer et al. in Frontiers in Psychology, 3, 456, 2012). To examine sources linked to the behavioural experience of the illusion, we studied inversion and Thatcherisation of faces (comparing across conditions in which no features, the eyes, the mouth, or both features were Thatcherised) on a set of event-related potential (ERP) components. Effects of inversion were found at the N170, P2 and P3b. Effects of eye condition were restricted to the N170 generated in the right hemisphere. Critically, an interaction of orientation and eye Thatcherisation was found for the P3b amplitude. Results from an individual with acquired prosopagnosia who can discriminate Thatcherised from typical faces but cannot categorise them or perceive the illusion (Mestry, Donnelly et al. in Neuropsychologia, 50, 3410-3418, 2012) only differed from typical participants at the P3b component. Findings suggest the P3b links most directly to the experience of the illusion. Overall, the study showed evidence consistent with both perceptual and decisional sources and the need to consider both in relation to configurality.

Item Type:Article
Uncontrolled Keywords:Attention; Cerebral Cortex; Discrimination (Psychology); Dominance, Cerebral; Electroencephalography; Evoked Potentials, Visual ; Facial Recognition ; Female ; Humans ; Male ; Optical Illusions ; Orientation ; Pattern Recognition, Visual; Perceptual Distortion; Prosopagnosia; Psychophysics; Young Adult
Group:Faculty of Science & Technology
ID Code:31896
Deposited By: Symplectic RT2
Deposited On:26 Feb 2019 16:51
Last Modified:14 Mar 2022 14:15


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