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Uploaded on Apr 1, 2008
Video-1 shows a visual aura from migraine headache like that suffered by Lashley and reported in 1941. "Normal vision" is transferred to the occipital brain cortex. The visual migraine aura begins with a "visual obscuration," or positive (pink stippling) alteration in vision that is followed by a loss (gray) of vision. This change took 22 minutes to cross his visual field, a distance of 67 mm in occipital cortex. Accordingly, Lashley concluded his migraine aura traveled at 3 millimeters/minute, an unheard of slow rate. (This video was created with the assistance of Mr. Dale Mertes from the University of Chicago.)