Even if it was shown that this area is active, that doesn't mean they are experiencing visual percepts.
2.
Blindsight patients show awareness of single visual features, such as edges and motion, but cannot gain a holistic visual percept.
3.
In a more richly textured visual world, the various visual percepts carry with them prior perceptual associations which often affect their relative spatial disposition.
4.
This is followed by an integration stage, where elements of the visual field combine to form a visual percept image, the'primary sketch '.
5.
Prior studies have already shown that blindsight patients are able to detect motion even though they claim they do not see any visual percepts in their blind fields.
6.
If the external process which presents the two potential states to awareness is interrupted ( by means of removing the stimulus ), the state of potential consciousness will remain on the most recently collapsed visual percept.
7.
Basing his views on the Constructivist theory of perception, Helmholtz ( 1821-1894 ) held that the visual system constructs visual percepts through a process of " unconscious inference ", in which cues are used to make probabilistic inferences about the state of the world.
8.
In 1760 he described a condition now called Charles Bonnet Syndrome, in which vivid, complex visual hallucinations ( fictive visual percepts ) occur in psychologically normal people . ( He documented it in his 87-year-old grandfather, who was nearly blind from cataracts in both eyes but perceived men, women, birds, carriages, buildings, tapestries and scaffolding patterns . ) Most people affected are elderly with visual impairments, however the phenomenon does not occur only in the elderly or in those with visual impairments; it can also be caused by damage elsewhere in their optic pathway or brain.
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