Vision (unit 3)

Question 1

frequency

Answer 1

distance from one peak of one wave to next wave

Question 2

short wavelength/high freq

Answer 2

blue/violet

Question 3

long wavelength/low freq

Answer 3

red

Question 4

amplitude

Answer 4

corresponds to brightness

Question 5

large amp/intensity

Answer 5

bright color

Question 6

small amp/intensity

Answer 6

dull color

Question 7

pupil

Answer 7

dark hole in center of iris reduces glare

Question 8

iris

Answer 8

pigmented muscle that gives eye color

Question 9

cornea

Answer 9

focuses light more sharply

Question 10

lens

Answer 10

reacts to bend rays of light so properly focused

Question 11

retina

Answer 11

contains photoreceptors rods and cones that transduce light energy to electrochemical energy

Question 12

fovea

Answer 12

where vision is shaped

Question 13

optic nerve

Answer 13

carries info to brain about light

Question 14

blind spot

Answer 14

optic nerve leaves eye on its way to the brain

Question 15

accomodation

Answer 15

eyes lens changes shape to help focus near or far objects on the retina

Question 16

nearsighted

Answer 16

light rays focus in middle of retina, eyeball is too long

Question 17

farsighted

Answer 17

focus behind fovea, eyeball is too short

Question 18

astigmatism

Answer 18

irregularity in shape of cornea or lens

Question 19

rods

Answer 19

can receive light energy in low light but are unable to detect color

Question 20

cones

Answer 20

detect color in light and functions in the daytime

Question 21

optic chiasm

Answer 21

fibers from nasal sides of two retinas cross

Question 22

visual cortex

Answer 22

occipital lobe of both hemispheres, contains specialized cells for visual perception

Question 23

feature detectors

Answer 23

activation of neurons in cortex that respond to specific features of stimulus

Question 24

parallel processing

Answer 24

processing of several aspects of the stimulus simultaneously

Question 25

trichromatic theory

Answer 25

3 different types of photoreceptors sensitive to different ranges of red, blue, and green

Question 26

opponent processing

Answer 26

suggests that receptor cells are linked in pairs working in opposition with each other