Term
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Definition
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Term
| The color of objects are largely determined by... |
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Definition
| the wavelengths of light that are reflected from the object into our eyes. |
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Definition
| Plots of the percentage of light reflected vs. wavelength |
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Definition
| The property of reflecting some wavelengths more than others |
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Definition
| Only some wavelengths pass through an object or substance |
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Definition
| Mixing lights, adding up the wavelengths of each light. |
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Term
| What happens when colored paints are mixed together... |
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Definition
| both paints still absorb the same wavelengths they absorbed when alone, so the only wavelengths reflected are those that are reflected by both paints. |
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Term
| Color is not a property of wavelength but... |
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Definition
| the brain's way of informing us what wavelengths are present |
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Term
| color-matching experiments |
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Definition
| observers adjust the amounts of 3 different wavelengths of light mixed together in a "comparison field" until the color mixture matches the color of a single wavelength |
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Term
| Young-Helmholtz Theory of Color Vision |
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Definition
| Color vision depends on 3 receptor mechanisms, each w/ diff spectral sensitivies |
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Term
| All visual pigments are made up of... |
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Definition
| opsin and a small light sensitive component called retinal. |
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Term
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Definition
| 2 physically different stimuli are perceptually identical. |
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Term
| Once a photon is absorbed, no matter what its wavelength... |
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Definition
| it has the same effect on the visual pigment |
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Term
| The ratios of response caused by the pigments are... |
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Definition
| the same for a particular wavelength |
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Term
| Simultaneous color contrast |
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Definition
| An effect that occurs when surrounding an area w/ a color changes the appearance of the surrounding area. |
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Term
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Definition
| -In the retina and LGN -respond w/ an excitatory response to light from one part of the spectrum and w/ an inhibitory response to light from another part. -part of physiology behind Opponent processing theory |
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Term
| Temporality of Trichromatic and Opponent Processing Theories |
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Definition
Trichromatic: Receptors respond w/ different patterns to different wavelengths
Opponent processing: Neurons integrate the inhibitory and excitatory signals from the receptors |
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Term
| Information contained in the firing of opponent cells transmits information about wavelength more efficiently... |
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Definition
| than info contained in the receptor response |
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Term
| Amount of light reaching depends on 2 things |
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Definition
1. Illumination: amount of light
2. Reflectance: properties of light |
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Term
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Definition
| An edge where the reflectance of 2 surfaces changes |
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Term
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Definition
| Edge where the lighting changes |
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