4. Vision - Extrastriate Cortex Flashcards
“midget” RGCs are also known as:
P cells (project to the parvocellular layers of the LGN)
“parasol RGCs are also known as:
M cells (project to the magnocellular layers of the LGN)
- small receptive fields
- sustained response
- low temporal resolution (increased visual acuity)
these are all characteristics of:
midget cells
- large receptive fields
- transient response
- high temporal resolution (decreased visual acuity)
these are all characteristics of:
parasol cells
midget cells are associated with:
form (looking at “what” something is)
parasol cells are associeted with:
motion (not worried about “what” but “where”)
destruction of the parvocellular layers of the LGN results in loss of:
form vision
destruction of the magnocellular layers of the LGN results in loss of:
motion vision
areas of V1 (particularly layers 2 and 3) that are rich in cytochrome oxidase
blobs
blobs project to _____ in V2 (secondary visual cortex), and interblobs project to to _____ in V2
thin stripes, pale and thick stripes
the thin stripes in V2 are associated with:
colour vision
the pale stripes in V2 are associated with:
form vision
the thick stripes in V2 are associated with:
motion vision
why is motion said to be colour blind?
due to the separation of the magnocellular (M) and parvocellular (P) pathways in the cortex
the “dorsal” stream of information from the visual cortex to the parietal lobe is concerned with:
motion
the “ventral” stream of information from the visual cortex to the temporal lobe is concerned with:
colour and form
go review the pathways on slide 349
oh my god why does making flashcards take forever
the medial temporal cortex (area MT) is specialized for:
processing visual motion
lesions to area MT result in:
very jerky and inconsistent tracking of moving objects
is it possible for specific cells in area MT to prefer specific directions of motion?
yes
integrates information from area MT and combines large receptive fields to make an even bigger receptive field
area MST
area MST is specialized for:
processing “optic flow” motion
the ventral temporal stream is specialized for:
form (a form is made of a series of edges)
it is thought that the further down the ventral temporal stream that information travels, the more:
complex the forms
the inferotemporal cortex is specialized for:
complex form processing
respond to complex visual stimuli
“elaborate” cells in the inferotemporal cortex
true or false: cells in the temporal stream are responsive to faces
true
part of the temporal cortex specifalized for recognizing faces
fusiform face area (FFA)
part of the temporal cortex specialized for responding to places
parahippocampal place area (PPA)
part of the temporal cortex specialized for responding to bodies
extrastriate body area (EBA)
the temporal cortex is modified by:
experience
