Dissociable Processes for Orientation Discrimination Learning and Contextual Illusion Magnitude



Wilks CEH, Rees G & Schwarzkopf DS (2014) Dissociable Processes for Orientation Discrimination Learning and Contextual Illusion Magnitude. PLoS ONE, 9 (7), Art. No.: e103121.

Previous research suggests an inverse relationship between human orientation discrimination sensitivity and tilt illusion magnitude. To test whether these perceptual functions are inherently linked, we measured both orientation discrimination sensitivity and the magnitude of the tilt illusion before and after participants had been trained for three days on an orientation discrimination task. Discrimination sensitivity improved with training and this improvement remained one month after the initial learning. However, tilt illusion magnitude remained unchanged before and after orientation training, at either trained or untrained orientations. Our results suggest that orientation discrimination sensitivity and illusion magnitude are not inherently linked. They also provide further evidence that, at least for the training periods we employed, perceptual learning of orientation discrimination may involve high-level processes.

General Biochemistry, Genetics and Molecular Biology; General Agricultural and Biological Sciences; General Medicine

PLoS ONE: Volume 9, Issue 7

FundersThe Wellcome Trust
Publication date31/12/2014
Publication date online25/07/2014
Date accepted by journal27/06/2014
PublisherPublic Library of Science (PLoS)

People (1)


Miss Charlotte Wilks

Miss Charlotte Wilks

PhD Researcher, Psychology