Multiple Choice Quiz


1	Two objects that are isoluminant
		A)	will, by definition, be metameric.
		B)	would always be judged to be the same color.
		C)	have the same physical intensity of light reflected off them.
		D)	contribute heavily to figure/ground segmentation.


2	Studies in color categorization suggest that
		A)	infants have different color categories than adults.
		B)	all cultures use the same color categories.
		C)	adults within a culture usually agree on the names of most of the colors they can discriminate
		D)	we can discriminate far more colors than we can categorize.


3	Color is best described as a property of
		A)	the mind.
		B)	objects.
		C)	light.
		D)	the eye.


4	A brand new sock and an often washed sock would differ mostly in
		A)	hue.
		B)	brightness.
		C)	luminance.
		D)	saturation.


5	Newton distinguished composite light from pure light because he believed
		A)	pure light came from the sun and composite light was reflected off objects.
		B)	pure light could not be further decomposed.
		C)	prisms disrupted the pure light into composite light.
		D)	a second prism could recombine composite light into pure light.


6	Two spectral colors that, when combined, result in the perception of white light are said to be
		A)	white-balanced.
		B)	inversely related.
		C)	complementary.
		D)	univariant.


7	The existence of metamers in color perception is exploited because
		A)	two stimuli that are perceptually indistinguishable are likely being treated identically by the visual system.
		B)	it reduces the number of stimuli that have to be considered for scientific study.
		C)	metamers can only be found in people with color deficits.
		D)	metameric stimuli define color categories.


8	One of the chief findings of Newton's color mixture experiments was that
		A)	saturation increased with increasing number of components.
		B)	it's difficult to predict what color will result from mixing two components.
		C)	changing the relative proportions of two components will not change the resulting hue.
		D)	it is possible to generate colors not present in the sun's spectrum.


9	Additive color mixture
		A)	has evolved in nature for millions of years.
		B)	works because the component primaries each keep a portion of the incident light from reaching your eyes.
		C)	is the basis for painting and printing.
		D)	is routinely used in television technology.


10	The propensity of an object's color to be mostly unaffected by the spectrum of light falling on that object is called
		A)	color contrast.
		B)	color constancy.
		C)	color neutrality.
		D)	color balance.


11	As the number of cone photoreceptor types ________ the number of color metamers ________.
		A)	increases; increases
		B)	increases; stays the same
		C)	decreases; increases
		D)	decreases; decreases


12	In the fovea you will find
		A)	only S cones and M cones.
		B)	only S cones and L cones.
		C)	only M cones and L cones.
		D)	d S, M and L cones.


13	Which of the following has not been used to support color opponency theory?
		A)	color afterimages
		B)	physiological evidence in the LGN.
		C)	color contrast effects.
		D)	the presence of 3 cone types.


14	The "blue-yellow" channel has been proposed to
		A)	calculate the sum of L cones and S cones.
		B)	calculate the difference between the M and L cones.
		C)	calculate the difference between the S cones and the sum of M and L cones.
		D)	calculate the difference between the L cones and the sum of M and S cones.


15	The response of neurons in cortical area V4
		A)	are closely correlated with the responses of LGN cells.
		B)	frequently demonstrate color constancy.
		C)	uniquely determine perceived color.
		D)	is necessary for achromatopsia to occur.

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