L21 Vision 2

Cards (8)

Outline the dorsal pathway. 
Located in the parietal lobe.
Helps with visually guided action - ‘how’
Input only from magnocellular cells, no colour.
Key areas: V1, V2, V5
What is the ventral pathway? 
Located in the temporal lobe.
Important for visual characteristics.
Input from magnocellular, parvocellular and konicellular cells - colour.
Key areas: V1, V2, V4
What is apperceptive agnosia? 
Cannot identify image
(Patient cannot form a percept to copy the image)
What is associative agnosia?
Cannot identify image but can form a percept to copy the image.
What is integrative agnosia? 
Can see the components but cannot put it together in a meaningful way.
What is optic ataxia? 
Damage to inferior and superior parietal cortex: disorder of visually guided action
What is hemispatial neglect?
Does not attend to half of the world, it does not exist to them.
Theories for hemispatial neglect:
Hemispherical rivalry and communication: damage to one hemisphere leads to hyper-excitation of the intact hemisphere.
Right hemisphere dominance theory: the left hemisphere attends to right hemispace , but the right hemisphere attends to both left and right hemisfields.