Subject SB
description
Transcript of Subject SB
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Subject SB
• Born in 1900, lost site in both eyes because of corneal infections
• Prior to 2 years of age; kept bandaged to reduce puss
• Went to a school for the blind to learn a trade; married
• Received a corneal graft in London at the age of 52
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Subject SB
Quite recently he had been struck by how objects changed their shape when he walked round them. He would look at a lamp post, walk round it, stand studying it from a different aspect, and wonder why it looked different and yet the same. (Gregory, 1974, p. 111)
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Subject Virgil
(Sacks, 1993)
During these first weeks [after surgery] I had no appreciation of depth or distance; street lights were luminous stains stuck to the window panes and corridors of the hospital were black holes. When I crossed the road the traffic terrified me, even when I was accompanied. I was very insecure while walking; indeed I am more afraid now than before the operation. (Virgil, May 10, 1993 from Sacks).
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Subject SB
The congenitally blind person especially, has to face the prospect of a difficult struggle before reaching a stage at which his vision permits him to understand the world around him. For a period of time varying with each patient, these people experience a confusing proliferation of perceptions, and they must learn to see as a child learns to walk. Moreover, personalities and character armors bult up as a blind person have to be shed, and they often find it difficult to change their ways of living. As one of our patients put it, “I had to die as a blind person to be reborn as a seeing person. (Valvo, 1971, p. 4)
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Recovered Sight
(Sacks, 1993)
During these first weeks [after surgery] I had no appreciation of depth or distance; street lights were luminous stains stuck to the window panes and corridors of the hospital were black holes. When I crossed the road the traffic terrified me, even when I was accompanied. I was very insecure while walking; indeed I am more afraid now than before the operation. (Virgil, May 10, 1993).
SB
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Recovered Sight(Fine, Wade, Wandell)
• Chemical accident at 3 yrs• One eye lost; other cornea destroyed• Blind from age 3 through 46 • Stem cell replacement in right eye for both epithelium and stem cells
Corneal epithelium
cellsLimbic stem
cells
Primary visual cortex is one-fourth the normal size
Motion selective cortex is the normal size
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MM
AAB
Primary Visual
Cortex And Nearby Regions Respond
Below Our Instrumental Sensitivity
Primary visual cortex is one-fourth the normal size
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MM
AAB
Motion Selective Cortex
Responds Powerfully, Is Retinotopic, And Has The Same Size As
Controls
Motion selective cortex is the normal size
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Ventral responses to objects and faces in Michael May and a control
OcP
LiGLiG
FuGFuG
OcP
LiGLiGFuGFuG
0 10.4 0.41
posterior
medial
MM AB
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Seeing Faces Is Special(Margaret Thatcher Illusion)
•Thompson,P.(1980) Margaret Thatcher: a new illusion. Perception 9 483-4.
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Seeing Faces Is Special(Margaret Thatcher Illusion)