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19 Cards in this Set
- Front
- Back
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Sensation |
process of detecting physical energies with sensory organs |
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Perception |
brain's interpretation of those messages |
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Sensory coding |
sensory receptors translate physical properties of stimuli into patterns of neural impulses; brain needs qualitative and quantitative information about a stimulus |
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Transduction |
a process by which sensory receptors produce neural impulses when they receive physical or chemical stimulation |
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Doctrine of specific energies |
Quality |
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Rate Law |
Quantity |
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Absolute Threshold |
Smallest amount of energy needed to detect a stimulus 50% |
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Sensory Transduction |
Process of converting energy in the environment into energy in the nervous system (touch) |
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Difference Threshold |
smallest detectable difference |
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Weber's Law |
The jnd is proportional to the magnitude of the original stimulus |
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Sensory adaptation |
a decrease in sensitivity to a constant level of stimulation |
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Vision |
the most developed sense in humans |
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Rods |
mostly on outer edges of retina; responds at low levels of illumination |
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Cones |
less sensitive to low light; responsible for seeing both color and detail; concentrated at fovea |
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Fovea |
area in center of retina with high density of cones |
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Blind spot |
area of retina in which ganglion axons depart eye, crowding out any photoreceptors |
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Trichromatic Theory |
activity in 3 different types of cones that are sensitive to different wavelengths; perception of color dependent on relativity of 3 waves -short waves: blue to violet -medium waves: yellow to green -long waves: red to orange |
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Opponent-Process Theory |
R/G, B/Y opposites; center of circle ON, outside OFF |
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Signal Detection Theory
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when signal is ambiguous, depends on sensory processes of judgment of evidence for and against |
