The illusion of uniformity does not depend on the primary visual cortex: evidence from sensory adaptation

Suárez-Pinilla, Marta, Seth, Anil and Roseboom, Warrick (2018) The illusion of uniformity does not depend on the primary visual cortex: evidence from sensory adaptation. i-Perception, 9 (5). pp. 1-13. ISSN 2041-6695

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Abstract

Visual experience appears richly detailed despite the poor resolution of the majority of the visual field, thanks to foveal-peripheral integration. The recently described Uniformity Illusion (UI), wherein peripheral elements of a pattern take on the appearance of foveal elements, may shed light on this integration. We examined the basis of UI by generating adaptation to a pattern of Gabors suitable for producing UI on orientation. After removing the pattern, participants reported the tilt of a single peripheral Gabor. The tilt after-effect followed the physical adapting orientation rather than the global orientation perceived under UI, even when the illusion had been reported for a long time. Conversely, a control experiment replacing illusory uniformity with a physically uniform Gabor pattern for the same durations did produce an after-effect to the global orientation. Results indicate that UI is not associated with changes in sensory encoding at V1, but likely depends on higher-level processes.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Informatics
Research Centres and Groups: Centre for Computational Neuroscience and Robotics
Sackler Centre for Consciousness Science
Subjects: R Medicine > RC Internal medicine > RC0321 Neurosciences. Biological psychiatry. Neuropsychiatry
Depositing User: Marianne Cole
Date Deposited: 29 Aug 2018 08:52
Last Modified: 02 Jul 2019 14:04
URI: http://sro.sussex.ac.uk/id/eprint/78371

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