Visual Processing Pathway (Eye, LGN, Visual Cortex, Dorsal and Ventral)
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| Two things that come with Perception of constructing reality | Perception
Akinetopsia
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| Define Perception | Allows us to interoperate the world around us
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| What happens with Akintopsia? | You see things in sequenced rays rather than smoothly
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| What do your senses pickup? | Touch: pressure
Sound: Airwave disturbances
Taste: chemical
Smell: Chemical
Vision: waves
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| Environment to the brain process | 1) Stimulus from external
2)Receptors of periphery
3)Thalamus
4)primary cortex
5)beyond
Eye-> Thalamus-> Occipital cortex
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| What helps us see? | Cornea and Lens work with light in order for retina to process the information being seen
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| What is the Retina made up of | Photoreceptors (cones and rods)
Ganglion cells
Bipolar cells
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| Define Rods | Low light active
color-blind
None in the fovea
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| Define Cones | High Light active
In fovea
Short, medium, Long
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| Define Red-blue Colorblindness | Missing medium cones or they don't work
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| What are the colors of each cone? | Short: Blue
Medium: Green
Long: Red
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| Define Fovea | Many cones
few rods
details and color
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| T or F, Saccades and Fixations don't allow the fovea to move in order for the fovea to capture images | F
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| Define blind spot | The optic nerve ends
No photoreceptors
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| What happens to center surround cells in the LGN/ Thalamus | Center: Faster firing rates
Surrounding: slower firing rates
Whole: Constant, nothing
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| What makes up the visual processing pathways | Thalamus
Visual Coding
Dot Detectors
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| Define Parallel Processing | Speed
Mutual influence requires multiple systems
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| What is LGN ? | Lateral Geniculate nucleus
Responsible for vision confirmation
sensory signals from the body goes to opposite hemispheres
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| Define visual coding | single celled
relationship between stimulus and nervous system response
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| Role of MT | Sensitive to speed of movement
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| Role of V4 | sensitive to color and shape
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| Role of V1 | Edge detection '
First cortical representation
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| Define Multiple Receptive fields | Orientation= edge
Motion=movement
corners
angles
less similarity=less firing
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| What system is known as the ___ | Ventral system
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| Define Ventral System | connected to occipital lobe and inferotemporal cortex
Aids in identification of visual objects
FFA and PPA
Damage= visual agnosia (difficult recognizing objects
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| Where system is known as ___ | Dorsal system
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| T or F, Damage to Ventral system = visual agnosia | T
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| T or F, Damage to Dorsal system= visual ataxia | T
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| define the dorsal system | connected to occipital and posterior parietal cortex
Knowing in where objects are located
Damage= Difficulty reaching objects (visual ataxia)
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| Patient D.F. had damaged her ventral stream which meant she could draw pictures from memory but not | copy and object exactly or recognize her own drawings
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| Define The Binding problem | seeing similar colors or letters and mistaking them
Conjunction error
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| 3 way in solving the binding problem is | Spatial position
Neural synchrony
Attention
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| Define neural synchrony | Group of brain cells firing at the same time
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| T or F, Insufficient attention doesn't lead to conjunction errors | F
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