How Do We See The World In 3D? 3

Question 1

What’s Euclidean

Answer 1

An accurate representation (personal space)

Vista space and action are not we can misinterpret these objects

Question 2

What the two dimensions an object can have

Answer 2

Binocular (only with both eyes)
Monocular (with one eye, or both)
Retini (info arises from here, back of eyes cones allow us to interpret 3d)

Question 3

What 3 types of cue are there

Answer 3

Ordinal- information of object order (in front/behind)
Relative- information of relative distance between objects
Body-scaled- information of egocentric distance to object

Question 4

What are ordinal cues

Answer 4

Fall into monocular category and are retinal

Occlusion- what we see is one object and another object

Question 5

What are relative distance cues

Answer 5

Monocular category and retinal

Brain hard wired to extract 3d information

Question 6

What are body scaled cues

Answer 6

Accommodation- process in which we change our focus
We need to change our muscle contraction to change amount of light or focus for a clear picture
We judge the contraction to see how far away an object is

Question 7

What is binocular horizontal disparity

Answer 7

Two eyes are about 6cm apart, so each gets a slightly different view
Relative depth is different
Only for close objects, further away the view is more similar

Question 8

What did fisher and fisher find about distance cues

Answer 8

Pointing response was related to accommodative position- shows we use this useful info about distance

Question 9

How does vergence help with distance cues

Answer 9

If you know the distance between the two eyes you can use the angle between them to work out the distance of the object
Useful in personal space

Question 10

What was weak fusion

Answer 10

Brain literally took an average of distance

But we are noisy biological creatures so huge amounts of uncertainty if one form is corrupted the whole average is wrong

Question 11

What is strong fusion

Answer 11

Incredibly complex neutral network process of complex structures
Impossible to falsify and doesn’t allow testing

Question 12

What is modified weak fusion

Answer 12

Weights averaging scheme
Allows a cue to be promoted but doesn’t allow other interactions
Robust and doesn’t allow noise to put it off

Question 13

How should vergence change

Answer 13

Weighting should decrease as discrepancy increases
Decrease as number of cues increases
Decrease as target distance increases

Question 14

What are the 3 different types of space

Answer 14

Personal space (grasp objects in front of you)
Action space (act on object in small time)
Vista space (at least 30m away)