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    Visual adaptation in migraine and non-headache control groups: local and global motion aftereffects (MAE) are pronounced in migraine, and both exhibit storage

    Shepherd, Alex J. (2005) Visual adaptation in migraine and non-headache control groups: local and global motion aftereffects (MAE) are pronounced in migraine, and both exhibit storage. In: National Headache Foundation 3rd Annual Headache Research Summit, 2005, California. (Unpublished)

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    Abstract

    Background A class of visual illusions known as aftereffects are enhanced in migraine, such that the tilt aftereffect is greater and the MAE lasts longer than for headache-free control participants (Shepherd, 2001). Objective The earlier studies used simple stimuli (gratings, stationary random dots) in which the aftereffects reflect activity in early visual cortex. This study extended the display types to engage extrastriate cortex, and assessed effects of delayed recovery from adaptation. Methods 50 migraine, 50 control participants adapted to a moving display before viewing a stationary or dynamic (random motion) test, which, consequently, appeared to move in the opposite direction. Half of the trials included a delay between the adaptation ending and the test. Results These results replicate and extend Shepherd (2001): MAEs lasted longer in migraine for stationary and dynamic tests. Dynamic MAEs survived delays completely for both groups, whereas stationary MAEs were reduced to a greater extent in migraine. Conclusion Static and dynamic MAEs are pronounced in migraine, which contradicts other reports that global motion perception is impaired. The effects on the recovery of the MAE following a delay suggest cellular fatigue-type mechanisms differ, between migraine and control groups, for early but not later visual cortical areas.

    Metadata

    Item Type: Conference or Workshop Item (Paper)
    School: School of Science > Psychological Sciences
    Depositing User: Sarah Hall
    Date Deposited: 18 Feb 2020 17:35
    Last Modified: 18 Feb 2020 17:35
    URI: https://eprints.bbk.ac.uk/id/eprint/31020

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