PSC 1 Lecture Notes - Lecture 6: I Love Paris, Process Theory, Amacrine Cell
Lecture 6: Perception II
• Complex objects are made out of simpler shapes
• V1 detects simple shapes
• Association cortex analyzes shapes, compares results to memory
• Agnosia: inability to recognize objects due to brain damage
o Prosopagnosia: faces
• Specific to face blindness, they can recognize objects
• Damage in ventral cortex
• Visual neglect: visual hemi field, only perceive one half of visual world
o Typically, have left hemi field neglect (right hemisphere damage)
o Can only draw one half of an object/ image
• Scotoma: you can know where something is and not know what it is
o Hold up an envelope and ask what is this? They have no idea what it is
o But if you ask to point to it, or where it was they can point to it.
Depth perception:
• Helps us know distance of objects
• It results from visual cues: Monocular and binocular "cues"
• Monocular cues are
o Only need one eye to get the cue
o Superposition is one type of it
• Complete object in front, partial object at back. Thus, our brain interprets that
they are at different distances
o Linear perspective is another one
• Found in 2D roman- Greek art, flat
• They didn’t understand linear perspective till renaissance
• All lines converge at the vanishing point
• Gives us a sense of depth, all induced depth
o Atmospheric perspective:
o Relative size
Colour vision
• Dogs to do not see colors the way we do
• Rhodopsin
• Different cells in the retina
o Receptor cells
o Bipolar cells
o Ganglion cells
o Pigment cells
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