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14 Cards in this Set
- Front
- Back
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sensory coding
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our sensory's translations of stimuli's physical properties into neural impulses
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transduction
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sensory coding begins here.
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Absolute Thresholds
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is the minimum intensity of stimulation that must occur before you experience a sensation, or the stimulus intensity detected above chance
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Difference Thresholds
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is the just noticeable difference between two stimuli -the min amount of change required for a person to detect a difference
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rods
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respond at extremely low levels of illumination and are responsible primarily for night vision.
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cones
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less sensitive to low levels of light levels; responsible primarily for vision under high illumination and for seeing both color and detail. Photopigments (inside cones) initiate the transduction of light waves into electrical neural impulses.
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Fovea
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near the retina's center, cones are densely packed here.
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transmission from eye-> brain
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-light is transduced into neural impulses by the R + C
-other cells perform on those impulses a series of computations -the outputs converge on one mil ganglion cells, they generate action potentials -signals go to the optic nerve -pass through the optic chiasm -pass the thalamus then to the R/L visual cortex |
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Lateral Inhibition
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-our visual system is senstive to edges because edges tell us where objects end.
- R/C are stimulated, send info to brain, and also sends info to its neighboring receptors inhibiting their activity -ex: black square grid |
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Proximity
(object perception) |
the closer two figures are to each other, the more likely we are to group them and see them as part of the same object.
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similarity
(object perception) |
one of these things is not like the other
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good continuation
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the tendency to interpret intersecting lines as continuous rather than as changing direction radically
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botton up processing
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patterns are relayed from lower levels to higher levels
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top down processing
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info from higher levels of processing can influence lower
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