Q U I Z # 3

1. The experiment by Wertheimer illustrating ___________ showed that the __________ theory of perception was incorrect.
a) apparent motion, structuralist            c) illusory contours, Gestalt
b) color constancy, structuralist            d) size constancy, Gestalt

2. In the constructivist approach to object perception, two general stages are usually recognized the ____________ stage and the _______________ stage.
a) primitive localization, componential recovery
b) pre-attentive, focused attention
c) pre-conscious, objective awareness
d) 2 1/2-D sketch, 3-D representation

3. Primitives are
a) neurons that respond to simple stimuli or components of more complex stimuli
b) perceptual objects created by combining a number of simpler stimulus units
c) simple, elementary units of perception which can be combined to form more complex objects
d) objects with the minimum number of geons necessary for recognition

4. Pop-out boundaries are most closely associated with
a) geons                      c) primitives
b) visual search            d) focused attention

5. Which of the following tasks would probably result in the longest subject reaction times if the subject is asked to "Find the red triangle"?
a) Display: 1 red triangle, 10 red circles, 10 red squares
b) Display: 1 red triangle, 20 green triangles, 20 yellow triangles
c) Display: 1 red triangle, 50 green triangles, 50 yellow triangles
d) Display: 1 red triangle, 10 green triangles, 10 red circles

6. In the feature integration approach to object perception, visual primitives for vision are combined to form perceptions in the ___________ stage.
a) preattentive                 c) 2 ½-D sketch
b) focused attention        d) integration

7. Feature integration theory (FIT) was proposed by
a) Irving Biederman        c) Bela Julesz
b) Ann Treisman            d) Hermann von Helmholtz

8. Pop-out boundaries are most closely associated with (duplicate question, same as # 4...)
a) geons                        c) primitives
b) visual search             d) focused attention

9. Which of the following has not been used by Treisman to identify primitives?
a) visual search
b) conjunction search
c) pop-out boundaries
d) geon recovery

10. Which constructivist model of perception was primarily developed for applications in computer vision?
a) Treisman: preattentive processing
b) Marr: computational approach
c) Biederman: recognition by components
d) Gestalt approaches to perception

Q U I Z # 4

1. Stereopsis is
a) the same thing as disparity
b) the perception of depth created from disparity
c) depth perception from oculomotor cues
d) depth perception from monocular cues

2. Uncrossed disparity occurs when objects are located
a) on the horopter
b) beyond the horopter
c) in front of the horopter

3. The depth cue of convergence
a) involves a bulging of the lens
b) involves the muscles of the eye
c) involves a comparison of the images in the left and right eyes
d) is responsible for stereogram type images

4. Which of the following is not a monocular depth cue?
a) linear perspective               c) atmospheric perspective
b) overlap                              d) stereopsis

5. The depth cue of accommodation
a) is a binocular depth cue
b) works best at distances greater than about 10 feet
c) works because the eyes turn inward as objects come closer to us
d) involves a change in the shape of the eye's lens

6. Stereopsis is (duplicate question, same as # 1...)
a) the same thing as disparity
b) the perception of depth created from disparity
c) depth perception from oculomotor cues
d) depth perception from monocular cues

7. If two surfaces are at different depth, any movement not perpendicular to the surfaces causes them to move relative to one another. This describes
a) linear perspective                   c) motion parallax
b) deletion and accretion            d) relative size

8. The horopter
a) is an imaginary circle indicating the location of objects that cast images on corresponding retinal points
b) passes through the point of fixation
c) refers to locations in the visual field that will result in disparate images on the retina
d) both a and b

9. Emmert's law states that
a) our perception of size depends on the presence of depth information
b) the farther away an afterimage appears, the larger it will seem
c) the farther away an afterimage appears, the smaller it will seem
d) afterimages are perceptually constant because they have the same retinal image size

10. The person who looks unusually small in the Ames room looks smaller because
a) they have a larger visual angle, so size constancy causes them to appear smaller
b) they have a smaller visual angle than the other person but appear to be at the same distance
c) they have the same visual angle as the other person but are actually much farther away
d) the person is not shorter, they are "vertically challenged"