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Definition
| Waves of electromagnetic energy between |
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Definition
| Controlled by the ciliary muscles |
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Definition
| a small indentation that allows us to see fine details. 25% of the primary visual cortex's focus dedicated to analysis of its input |
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Definition
| a part of the "completion" where our cortex fills in our blind spots |
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Definition
| theory that cones and rods mediate different types of vision |
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Definition
| cone mediated. Predominates in good lighting. Provides high acuity, COLORED perception |
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Definition
| Rod predominated. Sensitivity is not achieved without cost. Lacks both detail and the color of photopic |
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Definition
| half of retina next to nose |
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Definition
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Term
| Photopic Spectral Sensitivity Curve |
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Definition
| curve can be determined by having subjects judge the relative brightness in comparison to different wavelengths shone on the fovea |
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Term
| Scotopic Spectral Sensitivity Curve |
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Definition
| determined by judging relative brightness to light shown on the periphery retina |
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Definition
| red and yellow flowers appearing bright in comparison to blue, but minutes later it was reversed. And the evening made them all appear grey |
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Definition
| tremors, drift, and saccade(small jerky movements or flicks) |
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Definition
| conversion of one form of energy to another. |
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Term
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Definition
| pigment was exposed to intense light, it was bleached and could no longer absorb light. But when returned to the dark it regained its capacity. |
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Term
| Parvocellular Layer (P Layer) Top Four Layers PONS |
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Definition
composed of neurons with small cell bodies. parvo=small
Sensitive to color |
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Term
| Magnocellular Layers (M layers) Bottom Two layers. PONS |
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Definition
large bodies. magno=large
Sensitive to movement |
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Term
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Definition
| edges. Nonexistent stripes of brightness running along the edges. |
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Term
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Definition
-lateral eyes
-composed of very large receptors "ommatidia" |
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Term
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Definition
| because when a receptor fires, it spreads to laterally to an array of receptors |
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Term
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Definition
| area of a visual field where a visual stimulus can influence the firing of a neuron |
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Term
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Definition
| each neuron had a receptive field in one eye but not the other |
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Term
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Definition
| antagonistic "on" and "off" regions thus are unresponsive to diffuse light. All are monocular |
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Term
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Definition
-more numerous than simple cells
-larger receptive field
-are binocular, NOT monocular |
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Term
| Component Theory (trichromatic theory) |
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Definition
-proposed by Thomas Young
-three kinds of receptors |
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Term
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Definition
-Ewald Hering.
-two classes for encoding color and one for encoding brightness.
-one class signalled red, and the other signalled its complementary color green |
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Term
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Definition
| pairs of colors that produce white or gray when combined in equal measure |
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Definition
-perceived color is not a simple function of the wavelengths reflected by it.
-a color is constant, but the way in which we view it changes depending on the lighting conditions |
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Term
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Definition
-Edwin Land
-the color of an object is determined by its reflectance.
-visual system calculates by comparing the light reflected by adjacent surfaces |
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Term
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Definition
area receives most input from visual relay nuclei.
-located in Posterior region of occipital lobe |
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Term
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Definition
receive most input from primary visual cortex
-located in prestriate cortex and the inferotemporal cortex |
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Term
| Visual Association Cortex |
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Definition
receive input from areas of secondary, as well as other sensory systems
-located all over cerebral cortex but MOSTLY in the posterior parietal cortex |
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Term
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Definition
| an area of blindness, caused by damage to the primary visual cortex, blindness occurs in the contralateral field of both eyes |
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Definition
| chin held motionless on a chin rest and patient stares at a fixed point, and presses a button to record when dot is seen |
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Term
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Definition
| having a scotoma covering half the visual field |
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Definition
-damage to the posterior parietal cortex have difficulty reaching for objects but can describe them
-damage to inferotemporal cortex have no difficulty reaching, but cannot describe |
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Definition
| visual spatial perception and visually guided behavior |
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Definition
| specializes in pattern recognition, and conscious visual perception |
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Term
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Definition
| agnosia(failure to recognize) for faces. |
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Term
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Definition
| can see visual stimuli, but they dont know what they are |
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