PMID: 3768688Sep 24, 1986Paper

Control of human optokinetic nystagmus by the central and peripheral retina: effects of partial visual field masking, scotopic vision and central retinal scotomata

Brain Research
G C Van Die, H Collewijn

Abstract

Optokinetic nystagmus (OKN) was elicited in humans by a horizontally moving grating covering the whole visual field. Selective stimulation of central or peripheral parts of the retina was achieved by partial masking or scotopic viewing conditions in normals; three patients with a unilateral central retinal scotoma were studied in addition. In all cases, the elimination of foveal stimulation was accompanied by a decrease in OKN slow phase velocity compared to whole field stimulation. Vertical masks with retinally stabilized edges were used to selectively occlude or stimulate central or peripheral sectors with a fixed retinal location. A central stimulus was always more effective than the complementary peripheral stimulus, until the central zone was narrowed down to a width of 5-10 degrees. This central dominance was found throughout the range of velocities (6-180 degrees/s) and spatial frequencies (0.05-0.5 cycles/deg) used. A horizontal central band of occlusion caused a smaller decrease of OKN than a vertical occlusion with the same width. Scotopic vision caused a uniform mild decrease in OKN gain throughout the velocity range, provided that the spatio-temporal frequency of the stimulus remained within the scotopic resolution ...Continue Reading

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Citations

Jan 1, 1989·European Archives of Psychiatry and Neurological Sciences·H W Kölmel, H J Nabel
May 24, 2011·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·Sang Beom HanJeong-Min Hwang
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Dec 1, 2006·Journal of Neurophysiology·Miriam Spering, Karl R Gegenfurtner
Aug 4, 2020·Translational Vision Science & Technology·Soheil M DoustkouhiSteven C Dakin

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