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Author: Klaus Podoll, Markus Dahlem, Sofia Greene 09. September 2007
Edited by: Klaus Podoll, Markus Dahlem, Sofia Greene

Vision research

Seeing the bigger picture: Evidence for altered global motion processing in migraine

GE Gordon, V Manahilov, G Dutton, U Shahani, W Simpson

Visual deficits are common in migraine but are subtle and hard to measure. We studied patients with persistent migraine aura, a rare complication which might allow impaired processes to be examined more readily. We applied classification-image techniques to probe strategies used by observers in a task requiring the discrimination of the global motion direction of an array of 9 × 9 high-contrast elements. Direction of motion of each element was varied randomly (SD=15°); observers judged whether the near-threshold global-motion was to the left or right of vertical. Classification images were calculated by summing (element-by-element) noise samples eliciting right responses and subtracting samples producing left responses. Migraine-free controls used motion information from only the central 1° - 2° to determine direction of motion. pMA subjects, however, integrated motion information across a wider sparsely sampled area. This larger field of integration is suggestive of imbalanced centre - surround suppression in motion-processing mechanisms in pMA. The global nature of this task implies a locus for this effect beyond V1.

Altered visual processing in migraine patients with persistent visual aura

WT Chen, YY Lin, SJ Wang, JL Fuh, ZA Wu

Persistent aura without infarction is a rare but well recognized complication of migraine with unknown pathomechanism. We recruited six of these patients (5F1M, age 42.8 ± 11.6) to find if there exists any neurophysiologic aberrancy pertinent to their unique visual phenomenon. Each subject underwent magnetoencephalographic recording with the right eyes covered and the left eye stimulated by left hemi-field checkerboard reversals (1 reversal/s)... Our findings suggest an abnormal visual contrast processing in these patients, especially in low spatial frequencies. [more]

References

Chen WT, Lin YY, Wang SJ, Fuh JL, Wu ZA. Altered visual processing in migraine patients with persistent aura. First Conference of International Society for the Advancement of Clinical Magnetoencephalography, Matsushima, Japan, August 27-30, 2007 [PDF]
Gordon GE, Manahilov V, Dutton G, Shahani U, Simpson W. Seeing the bigger picture: Evidence for altered global motion processing in migraine. Perception 2007; 36 (ECVP Abstract Supplement): 140. [PDF]
Manahilov V. Investigating global visual perception. Research seminar at School of Psychology, University of Plymouth, UK, January 16, 2008 [PDF]

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nature proceedings
Pre-publication research on migraine with aura