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Visual Perception and Low Light Sensitivity Flashcard Set
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1
Question
1. A key area in the brain processing motion visual motion information is: a. the MT region b. the parietal cortex c. the superior colliculus d. the frontal cortex
Answer
b. the parietal cortex
2
Question
2. Korte’s laws refer to: a. apparent motion b. optic flow motion c. dynamic visual acuity d. critical flicker fusion frequency variation with luminance
Answer
a. apparent motion
3
Question
3. Motion defined by non-luminance cues is defined to be: a. first order motion b. second order motion c. third order motion d. apparent motion
Answer
b. second order motion
4
Question
4. True or false: two people can have the same static VA but different dynamic VA a. false b. true
Answer
b. true
5
Question
5. Size constancy is dependent upon: a. achromatic illumination b. adequate depth cues c. neither a nor b d. both a and b
Answer
d. both a and b
6
Question
6. In motion parallax, a. objects close to you appear to move more quickly than those further away b. very distant objects appear to move in the same direction as you c. misperceptions conveyed by static cues are accentuated d. both a and b
Answer
d. both a and b
7
Question
7. Which of the following is not a type of visual depth perspective? a. aerial perspective b. linear perspective c. nearness to the horizon d. none of the above
Answer
d. none of the above
8
Question
8. Emmert’s law refers to: a. spatial summation b. temporal summation c. scaling of size and distance d. optic flow computation
Answer
c. scaling of size and distance
9
Question
9. Which of the following is not a static monocular depth cue? a. interposition b. linear perspective c. texture gradient d. diplopia
Answer
d. diplopia
10
Question
10. Which of the following is not a Gestalt perceptual principle? a. linearity b. closure c. proximity d. symmetry
Answer
a. linearity
11
Question
11. The tendency for the parts of an object centered about a given axis to be highly similar in shape, texture, and color is termed: a. metamer b. similarity c. symmetry d. orientation
Answer
c. symmetry
12
Question
12. If Mo was viewing a set of items and she tended to group nearby objects together as a unit, she would be using the principle of: a. continuation b. identification c. proximity d. symmetry
Answer
c. proximity
13
Question
13. The “whole is different from the sum of the individual parts” is basic to: a. structuralism b. gestalt perception c. global psychology d. contour analysis
Answer
b. gestalt perception
14
Question
1. The fact that early arriving quanta have an effect on the photoreceptor membrane that lasts long enough to add to the effect created by later-arriving quanta is the underlying basis for: a. photopic summation b. disability glare c. temporal summation d. spatial summation
Page 1
Answer
c. temporal summation
15
Question
2. The law which applies to the apparent luminance of an intermittent light stimulus with an alternation frequency above the critical flicker frequency is: a. Freddo’s Law b. Ricco’s Law c. Brücke-Bartley Law d. Talbot-Plateau Law
Page 1
Answer
d. Talbot-Plateau Law
16
Question
3. Ricco’s law states that: a. below a critical duration there is complete summation of luminous flux regardless of how it is temporally distributed b. binocular summation is largely due to probability summation c. a photon must be absorbed to be effective in any photochemical reaction d. below a critical size there is complete summation of luminous flux regardless of how it is spatially distributed
Page 1
Answer
d. below a critical size there is complete summation of luminous flux regardless of how it is spatially distributed
17
Question
4. The fact that the CFF increases linearly with the log of the stimulus luminance is known as the: a. Brücke-Bartley phenomenon b. Ferry-Porter law c. Troxler effect d. Talbot Plateau law
Page 1
Answer
b. Ferry-Porter law
18
Question
5. You have a flash of light 50 units of luminance on for 20 msec. If you now double the light flash luminance, what should the time duration be? a. 10 msec b. 100 msec c. 1 msec d. 1 sec
Page 1
Answer
a. 10 msec
19
Question
6. When the retinal image is stabilized on the retina, vision fades. This is known as the: a. Brücke-Bartley phenomenon b. saturation c. Troxler effect d. Broca-Sulzer effect
Page 2
Answer
c. Troxler effect
20
Question
7. The Broca-Sulzer effect is a phenomenon observed when: a. the proportion of light and dark time of a flicker light is varied b. the luminance of a brief light flash is varied c. the duration of a light flash is varied d. the brightness of a flickering light is compared to a steady light
Page 2
Answer
d. the brightness of a flickering light is compared to a steady light
21
Question
8. You are measuring the dark adaptation curve in a patient with congenital stationary night blindness. You will find that: a. the cone branch is missing b. the rod branch is missing c. there is elevated rod threshold d. both (b) and (c) e. both (a) and (c)
Page 2
Answer
d. both (b) and (c)
22
Question
9. The photochromatic interval in the dark adaptation curve is: a. the difference between the minimum cone and rod thresholds b. the difference between the time taken for achieving the cone plateau and the rod plateau c. cannot be measured with a dark adaptation curve
Page 2
Answer
a. the difference between the minimum cone and rod thresholds
23
Question
10. Quantal fluctuations at low light levels in the background in a threshold versus intensity curve results in: a. Weber’s law b. dark noise c. DeVries-Rose law d. Piper’s law
Page 2
Answer
c. DeVries-Rose law
24
Question
11. The CFFs for a given percentage modulation are 2.5 and 50 Hz. A stimulus of 55 Hz presented at this given percentage modulation is seen as: a. steady b. flickering c. either steady or flickering
Page 3
Answer
a. steady
25
Question
12. The Brücke-Bartley phenomenon is another example of: a. Metacontrast b. brightness enhancement c. temporal enhancement d. saccadic suppression
Page 3
Answer
b. brightness enhancement
26
Question
13. Suppose an observer’s absolute (minimum) threshold is 6 quanta. If 9 quanta on average are emitted by the stimulus light during each trial in a minimum threshold experiment, then a. the subject will always respond YES b. the subject will respond NO on some trials c. the subject will respond NO more often than Yes d. the subject will respond Yes on 6 out of every 9 trials
Page 3
Answer
b. the subject will respond NO on some trials
27
Question
14. The law which applies to the apparent luminance of an intermittent light stimulus with an alternation frequency above the critical flicker frequency is: a. Bloch’s Law b. Ricco’s Law c. Pi’s Law d. Brücke-Bartley Law e. Talbot-Plateau Law
Page 3
Answer
e. Talbot-Plateau Law
28
Question
15. The separation of the chromophore and opsin and the resultant change in molecular conformation is called: a. photoisomerization b. transduction c. hyperpolarization d. bleaching
Page 3
Answer
a. photoisomerization
29
Question
16. At very high levels of stimulus intensity, the Weber fraction becomes large. This is an indication that the visual system is: a. acting as an ideal detector b. becoming saturated c. being limited by neural processing d. being limited by quantal fluctuations
Page 3
Answer
b. becoming saturated
30
Question
17. When the chromophore isomerizes, it changes into: a. all-trans-retinal b. all cis-retinal c. 9-cis-retinal d. 11-cis-retinal
Page 4
Answer
a. all-trans-retinal