Psy 355 Week 2 Review Paper
PSY 355 Exam #2 Review Sheet
Chapter 3: Spatial Vision: From Spots to Stripes
• contrast- the difference in luminance between an object and the background or between lighter and darker parts of the same object
• contrast acuity – the smallest spatial detail that can be resolved (with smallest amount of contrast)
• visual information processing- info goes from retina (optic disc) to -> down optic nerve -> to optic chiasm where fibers cross to opposite hemispheres of brain -> down optic tract -> to LGN (of thalamus) -> thalamus sends info to visual cortex in occipital lobes of each hemisphere
• visual pathways in the brain – optic nerve- leaves each eye at optic disk; information reaches optic chiasm, where medial fibers cross to …show more content…
• problem of univariance- an infinite set of different wavelength-intensity combinations can elicit exactly the same response from a single type of photoreceptor; one type of photoreceptor cannot make color discriminations based on wavelength
• subtractive color mixing- (painting); a mixture of pigments; if pigments A and B mix, some of the light shining on the surface will be subtracted by A, and some by B – only the remainder contributes to the perception of color
• additive color mixing – (televisions/computer monitors); a mixture of lights; if light A and light B are both reflected from a surface to the eye, in the perception of color the effects of those 2 lights add together
• rods and color vision- scoptic-refers to dim light levels at or below the level of bright moonlight; rods are sensitive to scoptic light levels; but all rods have same sensitivity to wavelengths of light, making it impossible for them to discriminate colors
• trichromatic theory of color vision- (see part 2)
• opponent process theory of color vision- (see part 2)
• explanation of color (of “negative”) afterimages- an afterimage whose polarity is the opposite of the original stimulus; light stimuli produce dark negative afterimages; colors are complementary; for example, red produces green and yellow produces
Chapter 3: Spatial Vision: From Spots to Stripes
• contrast- the difference in luminance between an object and the background or between lighter and darker parts of the same object
• contrast acuity – the smallest spatial detail that can be resolved (with smallest amount of contrast)
• visual information processing- info goes from retina (optic disc) to -> down optic nerve -> to optic chiasm where fibers cross to opposite hemispheres of brain -> down optic tract -> to LGN (of thalamus) -> thalamus sends info to visual cortex in occipital lobes of each hemisphere
• visual pathways in the brain – optic nerve- leaves each eye at optic disk; information reaches optic chiasm, where medial fibers cross to …show more content…
• problem of univariance- an infinite set of different wavelength-intensity combinations can elicit exactly the same response from a single type of photoreceptor; one type of photoreceptor cannot make color discriminations based on wavelength
• subtractive color mixing- (painting); a mixture of pigments; if pigments A and B mix, some of the light shining on the surface will be subtracted by A, and some by B – only the remainder contributes to the perception of color
• additive color mixing – (televisions/computer monitors); a mixture of lights; if light A and light B are both reflected from a surface to the eye, in the perception of color the effects of those 2 lights add together
• rods and color vision- scoptic-refers to dim light levels at or below the level of bright moonlight; rods are sensitive to scoptic light levels; but all rods have same sensitivity to wavelengths of light, making it impossible for them to discriminate colors
• trichromatic theory of color vision- (see part 2)
• opponent process theory of color vision- (see part 2)
• explanation of color (of “negative”) afterimages- an afterimage whose polarity is the opposite of the original stimulus; light stimuli produce dark negative afterimages; colors are complementary; for example, red produces green and yellow produces