visual perception and memory Flashcards
where is the extrastriate/prestriate cortex found
in the occipital lobe
does the superior colliculus feed straight into the prestriate cortex
yes
what does LGN stand for
Lateral geniculate body (nucleus)
what two things does the perceived colour of an object depend on?
the wavelength reflected by an object, and the wavelength reflected by the surroundings
what does colour constancy mean/do
the perceived colour of object doensn’t change when viewed in sunset
following V1 what are the names of the two streams visual processing is mediated by and how are they different
dorsal stream - where/how - visual motor processing
ventral stream - object analysis - what
where is the ventral stream located
inferior temporal lobe
where is the dorsal stream located
posterior parietal lobe
what does damage to the inferior temporal lobe cause
could tell what object was, but not the location
what does posterior parietal lesions cause
impaired object location, but could tell what it was - optic ataxia
what is optic ataxia
high order deficit in reaching to visual goals that occurs with posterior parietal cortex (PPC) lesions.
what is visual agnosia
deficits in aspects of visual perception without blindness
whats forms the final stage in the visual processing hierarchy
the inferior temporal cortex
What does the inferior temporal cortex receive signals from
extrastriate cortex
neurons in the inferior temporal cortex - their responses can show
invarience to changes in size, orientation - recognises the object regardless of viewpoint
sustained activity in absence of the object - reflecting short-term memory
