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Motion processing deficits in migraine are related to contrast sensitivity

Shepherd, Alex J. and Beaumont, H.M. and Hine, T.J. (2012) Motion processing deficits in migraine are related to contrast sensitivity. Cephalalgia 32 (7), pp. 554-570. ISSN 0333-1024.

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Official URL: http://dx.doi.org/10.1177/0333102412445222

Abstract

Background: There are conflicting reports concerning the ability of people with migraine to detect and discriminate visual motion. Previous studies used different displays and none adequately assessed other parameters that could affect performance, such as those that could indicate precortical dysfunction. Methods: Motion-direction detection, discrimination and relative motion thresholds were compared from participants with and without migraine. Potentially relevant visual covariates were included (contrast sensitivity; acuity; stereopsis; visual discomfort, stress, triggers; dyslexia). Results: For each task, migraine participants were less accurate than a control group and had impaired contrast sensitivity, greater visual discomfort, visual stress and visual triggers. Only contrast sensitivity correlated with performance on each motion task; it also mediated performance. Conclusions: Impaired performance on certain motion tasks can be attributed to impaired contrast sensitivity early in the visual system rather than a deficit in cortical motion processing per se. There were, however, additional differences for global and relative motion thresholds embedded in noise, suggesting changes in extrastriate cortex in migraine. Tasks to study the effects of noise on performance at different levels of the visual system and across modalities are recommended. A battery of standard visual tests should be included in any future work on the visual system and migraine.

Item Type: Article
Additional Information: The definitive version is available at www3.interscience.wiley.com
Keyword(s) / Subject(s): Migraine, visual perception, coherent motion, relative motion, noise, contrast sensitivity
School or Research Centre: Birkbeck Schools and Research Centres > School of Science > Psychological Sciences
Depositing User: Administrator
Date Deposited: 11 Oct 2012 08:34
Last Modified: 17 Apr 2013 12:33
URI: http://eprints.bbk.ac.uk/id/eprint/5211

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