sensation and perception

Question 1

definition of colour

Answer 1

visible light forms narrow band of frequencies in electromagnetic spectrum and within band different frequencies have different hues

Question 2

hue

Answer 2

determined by wavelength of light reflected

Question 3

saturation

Answer 3

how much white light is mixed in pure hue

Question 4

what does wavelength determine

Answer 4

hue

Question 5

blue sensitive cones

Answer 5

cones respond to short wavelengths 419nm

Question 6

green sensitive cons

Answer 6

medium wavelengths, 531nm

Question 7

red sensitive cones

Answer 7

long wavelengths 558nm

Question 8

pigment in cones

Answer 8

determine which wavelengths they best resond to

Question 9

how does brain interpret colour

Answer 9

from cones light is encoded as electrical signal

Question 10

anopias

Answer 10

insensitive to long, medium and short wavlenegths from missing cone

Question 11

anomolies

Answer 11

misalignment of l or m wavelengths in trichomats due to distribution deficiecny

Question 12

occulomotor cues

Answer 12

depend on ability to sense position of eyes and tension in eye msucles

Question 13

what happens when you look at close up images

Answer 13

tightening of ciliary muscles

Question 14

emmerts law

Answer 14

size constancy- objects that are the same size look differnt in retinal image if theyre at different distances

Question 15

atmospheric perspective

Answer 15

distant objects less sharp as light from distant object has to pass through more air and more blue light

Question 16

motion parallax

Answer 16

as observer moves relative to 3D scene, nearby objects appear to move slower

Question 17

stereo blindness

Answer 17

strabismus, failure to converge on common target

Question 18

Marr’s approach

Answer 18

bottom up, computational model, retinal image analysed sequentially at different levels

Question 19

pragnanz figure ground segregation

Answer 19

best solution is most stable and simple

Question 20

affecting properties of figure ground segregation

Answer 20

symmetry, convexity, area, orientation, meaning/ importance

Question 21

gestalts approach

Answer 21

whole is greater than sum of its parts

Question 22

gestalts features

Answer 22

similarity, good continuation, proximity, connectedness, closure, common fate, familiarity, invariance

Question 23

rods

Answer 23

night, high convergence, low acuity, monochromatic

Question 24

cones

Answer 24

daytime, less convergence, high acuity, 3 cones of colour

Question 25

receptive fields

Answer 25

area on retina which elicits change in firing rate of cell when stimulated

Question 26

retinal ganglion cells

Answer 26

condense raw data/ info from photo receptors

Question 27

lateral inhibition

Answer 27

a neuron’s response to stimulus is inhibited by excitation of neighbouring neurons

Question 28

sensory receptor cell

Answer 28

specialised neuron which responds to a particular physical property of environmental stimuli