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Motion perception in migraineurs: abnormalities are not related to attention.

McKendrick AM, Badcock DR, Badcock JC, Gurgone M

Department of Optometry and Vision Sciences, University of Melbourne, Carlton, and Centre for Clinical Research in Neuropsychiatry/Graylands Hospital, Nedlands, Australia. allisonm@unimelb.edu.au

Migraine groups have impaired ability to identify global motion direction in noisy random dot stimuli, an observation that has been used as evidence for cortical hyperexcitability. Several studies have also suggested abnormalities in cognitive processing, particularly in the domains of attention, visuo-spatial processing and memory. This study aimed to determine whether poor performance by migraineurs in motion coherence tasks could be explained by non-visual cognitive factors such as attention. Twenty-nine migraineurs and 27 non-headache controls participated. Global motion coherence thresholds were measured along with measures of neuropsychological function, using the Repeatable Battery for the Assessment of Neuropsychological Status (RBANS). The migraine group had significantly higher motion coherence thresholds than controls. No significant difference in attention or any other RBANS index score was found between groups. Index scores did not correlate with motion perception thresholds. This study does not support inattention or other cognitive abnormality as an explanation for motion perception anomalies in migraine.

Published 21 August 2006 in Cephalalgia, 26(9): 1131-6.
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