Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The
stimulus involved inphotostimulation
Etymologies
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Examples
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The RAM predicts perceptual phenomena in photostimulus mixtures that are analogous to perceptions of odors in mixtures.
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Since this state of cone responses is the condition for the perception of green, also represents the fuzzy truth value of the proposition "The photostimulus is green."
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The cone response ordering is M Just as more than one odor can be discriminated in an odorant, more than one hue can be perceived in a photostimulus.
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Alternately, a monochromatic photostimulus with wavelength around 570 nm is perceived as unique yellow, while a photostimulus with a complex spectral distribution can be perceived as greenish yellow.
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For example, a photostimulus is perceived as green when the M cone (that is sensitive to medium wavelengths of light) has a high absorption of photons and the S and L cones have low absorptions.
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A monochromatic photostimulus (of a single wavelength or a narrow band of wavelengths) has the least spectral complexity.
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Perceived complexity in a single photostimulus can be greater than in a mixture of several photostimuli.
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The RAM's explanation of perceived color constancy is the same as the RANC's explanation for olfaction: The RAM cells that respond to a photostimulus depend on the ordering of the cones 'responses, and that ordering does not change with photostimulus intensity.
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If perceptions of black and white are counted, a photostimulus perceived as a desaturated greenish yellow could have complexity as great as 4.
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When a greenish-yellow photostimulus is desaturated with both black and white components, for example, the perceived strength of at least one of these components is often so minute that identifying all four is difficult for most observers.
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