wk 6 SP

Question 1

Oculomotor cues

Answer 1

cues that depend on our ability to sense the position of our eyes and tension in our eye muscles

Question 2

pictorial cues

Answer 2

monocular cues - cues that can be depicted in a still picture

Question 3

Motion-produced cues

Answer 3

cues tht depend on movement of observer or of objects in environment

Question 4

Binocular disparity

Answer 4

a cue that depends on fact that diff eyes produce diff images

Question 5

The fact that an object can look the same size regardless of changing retinal image size is referred to as

Answer 5

size constancy

Question 6

Emmert’s Law states that objects that generate retinal images of the same size will look different in physical size if they

Answer 6

appear to be located at different distances.

Question 7

(iii) Relative Height

As objects get further away they get nearer the horizon

IF the objects are below eye height the highest object
is _____ _________

If the objects are above eye height then the lowest object
is _____ _________

Answer 7

furthest away

further away

Question 8

(iv) Atmospheric Perspective

Answer 8

Distant objects appear less sharp because more air and particles to look through.

Question 9

(v) Linear perspective

Answer 9

Lines that are parallel in the scene converge as they get further away.

Question 10

(vi)Shading and shadow

Answer 10

Shadows within objects - Attached Shadows

The shading that results from depth within an object is a cue to depth i.e. ATTACHED SHADOW. The meaning of shading is ambiguous. A depression and an elevation of a surface will be shaded on one side. Telling the difference relies on knowing the direction of the light source. We assume that light comes from above.

Question 11

Motion parallax

Answer 11

As an observer moves relative to a 3-D scene, nearby objects appear to move rapidly whereas far objects appear to move slowly.

Monocular cue to depth.

(e.g like mountains vs roadside in a car)

Question 12

Deletion and Accretion
((3) Movement-produced cues)

Answer 12

As one object moves in front of another, deletion occurs whereby the front object covers more of the back object.

As one object moves away from another, accretion occurs whereby the front object covers less of the back object.

Question 13

(4) Binocular disparity

Answer 13

Also called binocular stereopsis.

Cue depends on two eyes & fact that our eyes see the world from slightly different positions determined by the distance between them

Question 14

Corresponding Retinal Points

Answer 14

Regions on the two retinae that would overlap if you slid one retina on top of the other.

When you fixate on an object it will stimulate corresponding points in the two eyes.

Question 15

Non-Corresponding Retinal Points

Answer 15

Regions on the two retinae that would not overlap if you slid one retina on top of the other.

These points are separated on the retinae, and create disparity.

e.g: when you look at a tree, a bench in the background is not being focused on and therefore will show on different non-corresponding retinal points

The amount of disparity (between these retinal points) tells us how far the bench is from the tree.

(look at demonstration if confused)