COGSCI 1 FINAL EXAM UPDATED ACTUAL Questions and
CORRECT Answers
Ungerleider and Mishkin xperimented on monkeys different parts of brain removed
two pathways of visual processing dosal stream & ventral stream
Dorsal Stream where pathway
regions off visual cortex involved in perception of spatial location
begin = striate cortex
end = posterior cortex
Ventral Stream what pathway
regions off visual cortex involved in perception of form
begin = striate cortex
end = inferior temporal cortex
Marr's tri-level hypothesis Understanding how cogntive processes are implemented in the brain
holds mental or artifical infro processing events
Marr's Computational Level 1)
Highest, most abstract
what does the problem entail?
output?
purpose or reason of process
Aim for visual processing Object recognition
Marr's Algorithmic level 2)
Programming
Info processing steps: formal procudure, steps and order
Marr's Implementation level 3)
Lowest level
where is it being used phyiscally
human or computer
Marr's model of visual processing system takes complex patterns of unstructured stimuli into representations
object recognition
, Marr's model of visual processing Image projected onto the retina & analyzed based on intensity of light and dark
STAGE 1 areas
Adjacent regions of light and dark contract = edges & contour of basic features of
an object
Result = RAW PRIMAL SKETCH
Marr's model of visual processing RAW PRIMAL SKETCH -> group of objects simlar in size & orientation
STAGE 2
features -> representation of objects in 2.5D
Problem: object constancy of image in retina
Marr's model of visual processing 3D sketch of axes, symetry and elongation : Object parts
STAGE 3
Marr's stage 3: Symmetry Axis Lines that divides object into mirrored halves
Marr's stage 3: Elongation Axis line defining direction of bulk/mass of shape
Human Visual System First, input from retina is conveyed to optic nerve through optic chiasm to
superior colliculus in brainstem
Then to LGN (Lateral geniculate nuclues) of thalamus
Location of LGN Thalamus
LGN projects to AREA V1
(Primary visual cortex) maps to (striate cortex)
Area V1 info process begins
Retinotopically organized
- neighboring regions in visual field are represented by regions of V1
Feature detectors neurons in V1
sensitive to low-level features
filter out to create edges & contours
V1 projects to V2
V2 Process complex features of edges, shape, depth
Retinal Disparity Points in objects at different distances will be in different locations of two retinas
- you see different things if you close one side of the eye (L or R)
CORRECT Answers
Ungerleider and Mishkin xperimented on monkeys different parts of brain removed
two pathways of visual processing dosal stream & ventral stream
Dorsal Stream where pathway
regions off visual cortex involved in perception of spatial location
begin = striate cortex
end = posterior cortex
Ventral Stream what pathway
regions off visual cortex involved in perception of form
begin = striate cortex
end = inferior temporal cortex
Marr's tri-level hypothesis Understanding how cogntive processes are implemented in the brain
holds mental or artifical infro processing events
Marr's Computational Level 1)
Highest, most abstract
what does the problem entail?
output?
purpose or reason of process
Aim for visual processing Object recognition
Marr's Algorithmic level 2)
Programming
Info processing steps: formal procudure, steps and order
Marr's Implementation level 3)
Lowest level
where is it being used phyiscally
human or computer
Marr's model of visual processing system takes complex patterns of unstructured stimuli into representations
object recognition
, Marr's model of visual processing Image projected onto the retina & analyzed based on intensity of light and dark
STAGE 1 areas
Adjacent regions of light and dark contract = edges & contour of basic features of
an object
Result = RAW PRIMAL SKETCH
Marr's model of visual processing RAW PRIMAL SKETCH -> group of objects simlar in size & orientation
STAGE 2
features -> representation of objects in 2.5D
Problem: object constancy of image in retina
Marr's model of visual processing 3D sketch of axes, symetry and elongation : Object parts
STAGE 3
Marr's stage 3: Symmetry Axis Lines that divides object into mirrored halves
Marr's stage 3: Elongation Axis line defining direction of bulk/mass of shape
Human Visual System First, input from retina is conveyed to optic nerve through optic chiasm to
superior colliculus in brainstem
Then to LGN (Lateral geniculate nuclues) of thalamus
Location of LGN Thalamus
LGN projects to AREA V1
(Primary visual cortex) maps to (striate cortex)
Area V1 info process begins
Retinotopically organized
- neighboring regions in visual field are represented by regions of V1
Feature detectors neurons in V1
sensitive to low-level features
filter out to create edges & contours
V1 projects to V2
V2 Process complex features of edges, shape, depth
Retinal Disparity Points in objects at different distances will be in different locations of two retinas
- you see different things if you close one side of the eye (L or R)
