Blindsight.
The physiological basis for blindsight -- the ability to react adequately but unconsciously to visual stimuli -- is assumed to be due to the transmission of retinal impulses from the periphery of the retina, elicited by internal reflections of the refracted image illuminating the interior of the eye. These impulses are transmitted via the superior colliculi to phylogenetic old parts of the brain. These same mechanisms are supposed to be responsible for phenomena having been confused with 'filling-in'.
Widakowich
J
J
D006801:Humans; D010775:Photic Stimulation; D010802:Phylogeny; D012160:Retina / Q000502:physiology*; D014795:Visual Pathways