Elsevier

Vision Research

Volume 41, Issue 23, 1 October 2001, Pages 2961-2967
Vision Research

Filling-in of the foveal blue scotoma

https://doi.org/10.1016/S0042-6989(01)00178-XGet rights and content
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Abstract

The blue-blindness (tritanopia) of the human foveola normally goes unnoticed but can be directly visualized by having observers view a flickering, monochromatic, short-wavelength field. The blue scotoma appears as a tiny dark spot in central vision, the visibility of which depends upon the wavelength of the field and the temporal frequency of modulation. Comparisons of fading times as a function of flicker frequency for the blue scotoma, foveal afterimages and optically stabilized images indicate a common time course, consistent with the hypothesis that perceptual filling-in of the foveal blue scotoma reflects the operation of neural processes similar to those involved in fading and regeneration of stabilized images.

Keywords

Scotoma
Foveal blue-blindness
Perceptual filling-in
Stabilized images

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