NSCI 225 LEARNING CHECK 2 | QUESTIONS AND
ANSWERS | SOLVED 100% CORRECT.
retinotopic mapping Answer - Spatial organization in LGN and Cortex
- Flipped from what shows up in visual field
- Center magnified, Fovea does more processing, takes up more space
Column Organization Answer - The organization PVC cells that respond to
similar stimuli
- 6 layers stacked on top of each other, each layer processes the same info =
location of individual field, orientation of lines, which eye is dominant
- Every single column respond to same location within retina, if orientation
changes, neighboring receptive fields activated
- 6 cells down column give same recording
Hyper-Column Answer - Location column, has every orientation of line, L and R
dominance
- location columns emphasize location in visual field, hyper column highlights
that the big columns have different types of cells
First place we have binocular cells Answer - PVC/Cortex
- Information from either eye, still have preference from one eye
, Where is your receptive field Answer - ALWAYS on retina
Grating adaptation Answer - - Simple cell firing, neurons adapt after extended
exposure, neurons fire less when stimulus repeated
- Grating adaptation ONLY occurs if adapting grating has same orientation as
test grating
→ adapting cells are orientation specific
- Happens first in the CORTEX
- Interocular transfer: adapting with 1 eye but effect still present in other
(binocular cells)
Extrastriate areas Answer - V1, V2, V3, V4, V5
- code for increasingly complex components of vision, objects get more
complex, shape forms, then object uniqueness, size of receptive field gets
larger
- as we move further down the pathway, we have more specific types of
receptive fields (IT Cortex neurons)
"Where" pathway Answer - parietal cortex, dorsal stream
- Patient RV had damage (could not do action, bad at grasping rocks, can copy
images/recognize)
--> Bilateral parietal damage, damage/ optic ataxia, SUBconscious, How
pathway also
"What" Pathway Answer - temporal cortex, ventral stream
- Agnosia
- Patient DF had damage to WHAT pathway, could put card in slot, but couldn't
match orientation, couldn't ID family until they spoke, unable to describe
orientation, conscious
ANSWERS | SOLVED 100% CORRECT.
retinotopic mapping Answer - Spatial organization in LGN and Cortex
- Flipped from what shows up in visual field
- Center magnified, Fovea does more processing, takes up more space
Column Organization Answer - The organization PVC cells that respond to
similar stimuli
- 6 layers stacked on top of each other, each layer processes the same info =
location of individual field, orientation of lines, which eye is dominant
- Every single column respond to same location within retina, if orientation
changes, neighboring receptive fields activated
- 6 cells down column give same recording
Hyper-Column Answer - Location column, has every orientation of line, L and R
dominance
- location columns emphasize location in visual field, hyper column highlights
that the big columns have different types of cells
First place we have binocular cells Answer - PVC/Cortex
- Information from either eye, still have preference from one eye
, Where is your receptive field Answer - ALWAYS on retina
Grating adaptation Answer - - Simple cell firing, neurons adapt after extended
exposure, neurons fire less when stimulus repeated
- Grating adaptation ONLY occurs if adapting grating has same orientation as
test grating
→ adapting cells are orientation specific
- Happens first in the CORTEX
- Interocular transfer: adapting with 1 eye but effect still present in other
(binocular cells)
Extrastriate areas Answer - V1, V2, V3, V4, V5
- code for increasingly complex components of vision, objects get more
complex, shape forms, then object uniqueness, size of receptive field gets
larger
- as we move further down the pathway, we have more specific types of
receptive fields (IT Cortex neurons)
"Where" pathway Answer - parietal cortex, dorsal stream
- Patient RV had damage (could not do action, bad at grasping rocks, can copy
images/recognize)
--> Bilateral parietal damage, damage/ optic ataxia, SUBconscious, How
pathway also
"What" Pathway Answer - temporal cortex, ventral stream
- Agnosia
- Patient DF had damage to WHAT pathway, could put card in slot, but couldn't
match orientation, couldn't ID family until they spoke, unable to describe
orientation, conscious
