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32 Cards in this Set
- Front
- Back
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visual perception
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our internal representation of light
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wavelength
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perception of color
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intensity
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perception of brightness
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Iris
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donut band of contractile issue-color of eye
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pupil
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hole through which light enters- adjusts according to illumination
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sensitivity (pupil)
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ability to detect the presence of dimly lit objects
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acuity (pupil)
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ability to see the details of objects
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sharpness
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depth of focus
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Lens
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transparent, biconvex structure behind pupil
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retina
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thin layer of tissue in the back of the eye, contains light sensitive cells that transform light to neural signals
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Fovea
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indentation at the center of the retina specialized for high-acuity vision
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Blind spot
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gap in the receptor layer of the retina where bundle of ganglion cell axions leave the eye
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Photoreceptor cell
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transforms light to neural signal- rods and cones
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Completion
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info provided by receptors around blind spot t of ill in the gaps in images
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Surface interpolation
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process by which we perceive surfaces
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duplexity theory
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rods and cones mediate different types of vision-high light vs low light
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spacial acuity
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ability to see details
cones: high acuity rods: low acuity |
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light sensitivity
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ability to see when light is dim
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more
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rods are ___ sensitive to light than cones
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color sensitivity
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each kind of photoreceptor is especially sensitive to light within a certain range of wavelength
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one
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rods have ___ kind of pigment
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three
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cones have ___kind of pigment
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Photopic vision
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colorful scene, full of color
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scotopic vision
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blurred scene, sensitivity to very weak light
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Fovea
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No rods in ____
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Receptive field
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the area within which the presence of a stimulus
will alter the firing of a neuron |
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Lateral inhibition
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when a receptor fires, it inhibits its neighbors via the lateral neural network
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Trichromatic Theory
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There are three types of color receptor in human eyes
three diff wavelengths of light in diff proportions |
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opponent-process theory
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two diff classes of cells in the visual system for encoding color and for encoding brightness
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Main pathway
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Retinal ganglion cell-> Lateral geniculate nuclei (LGN)-> Primary visual cortex (striate cortex, V1)
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Magnocellular layers
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Bottom two layers of
LGN • Big cell bodies • Input primarily from rods • Particularly responsive to movement |
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Parvocellular layers
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op four layers of LGN
• Smaller cell bodies • Input primarily from cones • Color sensitive • Higher spatial acuity • Prefer still or slowly moving objects  |
