Perception of colour, form, depth and movement;...
Transcript of Perception of colour, form, depth and movement;...
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Perception of colour, form, depth and movement;
organization of associative visual fields
SeminarProf Maja Valić
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Perception of colour, form, depth and movement
• binding problem in the visual system: how information conveyed in parallel but separate pathways is brought together into a coherentperception?
• Motion, depth, form, and color-are coordinatedinto a single visual image
• The magnocellular (M) and parvocellular (P) pathways feed into two extrastriate cortical pathways: a dorsal pathway and a ventral pathway.
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The Parvocellular and Magnocellular PathwaysFeed Into Two Processing Pathways
in Extrastriate Cortex
• P pathway continues in the ventral cortical pathway that extends to the inferior temporal cortex
• M pathway becomes the dorsal pathway that extends to the posterior parietal cortex.
• motion and depth, mediated in large part by the dorsal pathway to the posterior parietal cortex (M)
• Perception of contrast and contours, mediated largely by the ventral pathway extending to the inferior temporal cortex (P).
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• The pathways arising from M (magnocellular neurons) are associated with identifying the location of the visual image. (where?)
• the P (parvocellular pathway) is associated with form and color. (what?)
• Recognition of faces and other complex forms depends upon the inferior temporal cortex. (P)
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Posterior parietal area
Prestrial area
Primary visual cortex (area striata)
Inferotemporal area
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Dorsal pathway
Primary visual cortex
Ventral pathway
M
P
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Role of visual cortex
• 1) V1: separation of visual information for color, form, movement and depth.
• 2) V2: sending visual information to the parietal or temporal pathway
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• 3) Asocitive visual fields involved in color and form perception (P-system); associative visual fields involved in movement perception (M-system)
• 4) Asociative visual field V4 mediates the information from P-pathway into the temporal region;
• field V5 mediates information from M-pathway into the parietal region.
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Color Vision• Color is subjective experience tied to the
spectral composition of the light• Starts with the fotoreceptors in retina
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The role of photoreceptors
• human retina consists of two types ofphotoreceptors: the rods and cones
• functional regions: an outer segment, an inner segment, and a synaptic terminal
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• The outer segment is located toward the outer surface of the retina and is involved in phototransduction
• contain light-absorbing photopigments• The outer segments are constantly being renewed• The inner segment contains the nucleus and most
of the biosynthetic mechanisms.• The synaptic terminal makes synaptic contact with
the other cells.
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Cones
• are responsible for daylight vision• mediate color vision• have a fast response, and their integration time is
short• they are concentrated in the fovea
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Rods
• highly sensitive and can detect dim light• specialized for night vision• The loss of rods results in night blindness and loss
of peripheral vision.
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PHOTOTRANSDUCTION
• cyclic guanosine monophosphate (cGMP)–gated Na+ (sodium) channels
• cGMP binds directly to the cytoplasmic side of the channel, which causes it to open, allowing an influx of Na+
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• During darkness, the presence of high levels of cGMP in photoreceptors results in opening of Na+ channels, and an inward current carried by Na+ flows into the outer segment of the photoreceptor.
• photoreceptors remain depolarized during darkness
• K+ (potassium) flows out across the inner segment of the receptor membrane through nongated K+(leakage) channels.
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DARK LIGHT
Rodopsin is not activated
cGMP keeps Na+ channels openSodium (Na+) ions enter the cone and depolarization occurs
Cones release glutamate
Light affects rodopsin
cGMP is degraded and Na+ channels are closed
Na+ does not enter so cones are hyperpolarized
Release of glutamate is decreased
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Cones for Short lenght waves - blue
Cones for Medium lenght waves – green and yellow
Cones for Long lenght waves -red
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P and M system – perception of color and form
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• When a special stain (cytochrome oxidase) for identifying mitochondrial enzymes is applied to the visual cortex, it reveals two types of staining patterns.
• Electrophysiology experiments reveal different function in different staining patterns.
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• “blobs” (V1) andnarrov lines (V2) are part of P system for color and form
• wide lines (V2) are part of M system for perception of movement
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• PET scan immages and functional Magnetic resonance reveal functional distinction of visual cortex in human.
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Color Blindness
• CAUSE: congenital, hereditary• 8% men and about 0.05% women• Coupled to the x-chromosom – mothers give it to
their sons• HEALTHY cones are trichromate
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3 types of dichromates
• 1) Protanopia: loss of the L cones (red)• 2) Deuteranopia: loss of the M cones (green)• 3) Tritanopia: loss of the S cones (blue)
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Milde impairments
• 1) Protanomalia: dammage of the L cones (green)
• 2) Deuteranomalia: dammage of the M cones (green)
• 3) Tritanomalia: dammage of the S cones (green)
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Monochromate color blindness
• Completely color blind
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Ishihara Test for Color Blindness
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How do they see it?
Normal Protanopia Deuteranope Tritanope
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Normal Protanope Deutanope
This is how numbers look to a dichromate (only two photopigments) on a color vision test.
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DeuteranomalyProtanomalyNormal
This is how numbers look to an anomalous trichromate (three photopigments, one pigmentis just a little off) on a color vision test. The defect is not as severe compared to a dichromate.In fact, some of the test numbers can be seen by an anomalous trichromate.
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DeuteranopeProtanopeNormal
This is how objects look to a dichromate
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Color Normal Dichromat
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Color Normal Dichromat
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Color Normal Dichromat
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Perception of Form
• Distinction beetween the form and the background
• Gestald psychology
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Perception of the edges
Mach bands
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Perception of the motion
• Peripheral retina can only see moving object• Motion is analysed in the Dorsal Pathway to the
Parietal Cortex• Motion is represented in the Middle Temporal
Cortex• Visual system perception of the motion :
– a) based on the movement of the object – b) based on the neural signals from the moving
eyes and had
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Depth Vision
• Depends on monocular cues and binocular disparity
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Monocular cues
• 1) Familiar size• 2) Occlusion (one person is partialy hiding
another)• 3) Liner perspective• 4) Size perspective• 5) Distribution of shadows and illumination• 6) Motion parallax
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• Information from the two eyes is first combined in the primary visual cortex (V1).
• Brain calculates the disparity between the images seen by the two eyes and then estimate the distance based on simple geometric relations.
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Familiar size
Occlusion (one person is partialy hiding another)
Size perspective
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Gradient of the texture
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Form is constant
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Effects of Lesions of the Occipital andTemporal Regions of the Cortex
• Primary Visual Cortex • a total lesion of the visual cortex will produce a
contralateral homonymous hemianopsia• lesion restricted to the inferior bank of the calcarine
sulcus will cause an upper quadrantanopia
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• Secondary Visual Areas (in Occipital Cortex)
• visual agnosia (failure to understand the meaning or use of an object)
• color agnosia (inability to recognize)
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• Inferotemporal Cortex• prosopagnosia = the loss of the ability to
recognize familiar faces• Middle Temporal Cortex• movement agnosia = the patient cannot
distinguish between objects that are stationary and those that are moving.
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Visual ilusions
• No scientific explanation
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Thank you!