Sensation & perception- Test 3

the reflectance curve for a purple piece of paper would

A. reflect short wavelengths

B. reflect long wave lengths only

C. reflect all wave lengths equally

D. reflect long and short wavelengths

D. reflect long and short wavelengths

yellow and blue light are projected on a white screen. what color will the screen appear to be?

A. white

B. grey

C. green

D. purple

A. white

color matching experiments show that if a person with full color vision is given at least ____ wavelengths to mix together, the person can match any single wavelength.

A. 2

B. 3

C. 4

D. 5

B. 3

in order to distinguish between wavelengths independent of light intensity, one must have at least ___ visual pigment

A. one

B. two

C. three

D. no visual pigments are required

B. two

Dr. lanzilotti wants to create a stimulus that will produce an afterimage of a red heart shape against a white background. he should make the heart ____ and the background ____.

A. red;green

B. green;black

C. blue;white

D. pink;red

B. green;black

which statement below best describes the current consensus on the theories of color vision?

A. the physiological support for the trichomatic theory is greater than the support for the opponent-process theory

B. the physiological evidence for the opponent- process theory has shown that the trichromatic theory is incorrect

C. the psychophysical evidence for the trichromatic theory has shown that the opponent-process theory is incorrect

D. the physiology of the cone receptors and the discovery of opponent cells in the retina and LGN show that both theories are correct

D. the physiology of the cone receptors and the discovery of opponent cells in the retina and LGN show that both theories are correct

A unilateral dichromat ____

A. has trichromatic vision in one eye and dichromatic vision in the other eye

B. can only see black, white, and greys

C. can match any wavelength with three wavelengths in the comparison field, but is not as good as trichromats at discriminating small differences in wavelengths

D. is more common in the U.S than protonopes

A. has trichromatic vision in one eye and dichromatic vision in the other eye

which of the following statements is true about dichromatism

A. males are more likely to be dichromats than females

B. experience, not genetics, is the major cause of dichromacy

C. there are six major forms of dichromacy

D. there are nine major forms of dichromacy

A. males are more likely to be dichromats than females

physiological evidence shows that deuteranopes do not have the ___ wavelength cone pigment

A. short

B. medium

C. long

D. short and long

B. medium

D. increased firing rate fo S+/(M/L)-neurons

short wavelength light cause which of the following responses in opponenent process neurons found in the LGN

A. decreased firing rate of M+/L-neurons

B. increased firing rates of S-/(M/L)+neurons

C. increased firing rate of L+/M-neurons

D. increased firing rate of S+/(M/L)-neurons

trichromat

a person with normal color vision

anomalous trichromatism

a type of color defiency involving three cones that behave differently than normal

opponent neurons

cells that show excitatory response to some wavelengths and inhibitory response to others

unilateral dichromat

a person who has dichromatic vision in one eye and trichromatic vision in the other eye

selective reflection

when an object reflects some wavelengths of the spectrum more than others

monochromat

a person who is completly colorblind and sees everything in shades of grey

unique hues

color with hue, such as blue, yellow, red, or green

dichromat

a person with only 2 functioning cones who is color deficient

binocular disparity

result of falling on two different places on the left and right retinas

steropsis

impression of depth that results from binocular disparity

conflicting cues theory

a theory of visual illusions which states that our perception of line length depends on an integration of the actual line length and the overall future length

size- distance scaling

a hypothesized mechanism that helps maintain size constancy by taking an objects perceived distance into account

relative disparity

difference between two objects absolute disparities

ponzo illusion

an illusion of size in which two objects of equal size that are positioned between two converging lines appear to be different in size

binocular vision

magnitude of difference between where an object falls on the left and right retinas

size constancy

occurs when the size of an object is perceived to remain the same even when it is viewed