A NEUROLOGICAL BASIS FOR VISUAL DISCOMFORT

ARNOLD WILKINS, IAN NIMMO-SMITH, ANNE TAIT, CHRISTOPHER McMANUS, SERGIO DELLA SALA, ANDREW TILLEY, KIM ARNOLD, MARGARET BARRIE, SYDNEY SCOTT
1984 Brain  
Certain patterns of stripes are judged to be unpleasant to look at. They induce illusions of colour, shape and motion that are sometimes perceived predominantly to one side of fixation. People who suffer frequent headaches tend to report more illusions, and if the pain consistently occurs on the same side of the head the illusions tend to be lateralized. The parameters of the patterns that induce illusions (including their shape, spatial frequency, duty cycle, contrast and cortical
more » ... rtical representation) closely resemble those that elicit epileptiform electroencephalographic abnormalities in patients with photosensitive epilepsy. The viewing conditions under which such abnormalities are likely to appear are also those under which more illusions are seen.
doi:10.1093/brain/107.4.989 pmid:6509314 fatcat:gghx5munpbfvdocjciqxpqwjji