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26 Cards in this Set
- Front
- Back
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Light |
electromagnetic energy, the photon is the basic unit of light |
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Wavelength |
color/hue/saturation is the purity of the color |
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Amplitude |
Top to bottom intensity/brightness |
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Retina |
at the back of the eye contains photoreceptors |
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Pupil |
hole to let light in |
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Iris |
Muscle that controls how much light is let in |
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Fovea |
Part of the retina central point of focus highest acuity more cones |
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Blindspot |
no photo receptors because of the optic nerve |
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Rods |
Photoreceptor very sensitive to light (dim light) easily bleached concentrated in the periphery |
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Cones |
Photoreceptor not very active in dim light, essential for color vision, acuity, concentrated in fovea |
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Lateral Geniculate nucleus |
recieves visual information from optic nerve, sends information to primary visual cortex, located in the thalamus relay center, looks like a thumbprint each layer recieves info from only 1 eye |
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Visual feild |
everything you can see |
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Receptive feild |
the feild of vision a single receptor or receptors attached to a single ganglion cell percieve |
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Center surround Receptive feild |
the receptive feild of a ganglion cell has two parts center which is more sensitive and surround which is bigger,they are mutually antagonistic, there are ON/OFF center types and the ganglion cells respond best when there is contrast |
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Trichromatic Color theory |
we see color based on the type of cones in our eyes, blue green and red cones, respond best when different colored light is shown on them |
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Opponent process coding |
Neurons respond specifically to paires of primary colors, red opposing green, blue opposing yellow, retinas contain two kinds of color sensitive ganglion cells, yellow on blue off, blue on yellow off,red on green off, green on red off |
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After image |
firing when image is taken away |
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Parvocellular |
small cell bodies near fovea fine details colors, primates, in P layers of LGN |
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Magnocellular |
large cell bodies in periphery,large receptive feild, Motion, in M layers of LGN |
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Koniocellular |
small but throughout retina project to many areas, primates, important for blue light |
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Ganglion cells |
see dots |
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Primary visual cortex |
sees lines and orientation of line |
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Cytochromic oxidase blobs |
anayze color |
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Visual association cortex |
analyze visual information |
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Ventral Stream |
What, Color, input from PArvocellular magnocellular and koniocellular |
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Dorsal Stream |
Where, How, Movement, mostly magnocellular input |
