Lecture 2

Question 1

Is peripheral vison blurry?

Answer 1

no

Question 2

What happens when color vision doesn’t work?

Answer 2

Protanopia- missing L cones (red green color blindness)
Deuteranopia- missing M cones
Tritanopia- Missing S cones
Achromatopsia- No colors, a result of damage to the brain not the eye.

Question 3

What is image segmentation?

Answer 3

what part of the image belongs to the object and what
belongs to another object.
Eg cat with white background is easy to tell apart but
not when camouflaged.

Question 4

How do we represent our recognition of objects in our brain, what are the theories?

Answer 4

Template theory: compare representation of the object with representation in our memory.
The issue with this theory is that we would need to store wayyy to many templates/information and it doesn’t account for different viewpoints and occlusion

Ex. we represent E like this but the E can come in many different fonts so we store many different E’s in different fonts and compare

Feature analysis/deconstruction: break down image into basic features

Ex. where it ends, size, angles, colour
i.e this E would have 3 horizontal lines, 1 vertical, 4 right angles and is black

^this one is most likely to be true

Question 5

Orientation adaptation

Answer 5

• show right diagonal lines, 15 second habituation then show straight ones person will thing they tilted left.

Question 6

Disorders of Object Perception:
Visual Agnosia-
Prosopagnosia-
Balint’s syndrome-

Answer 6

Visual agnosia- people see shapes and colors but cannot
recognize objects. They can however recognize faces. They also cannot read. They don’t know what something is but know where it is.

Prosopagnosia- Inability to recognize faces. use context based recognition such as clothes and hair. can understand emotion and judge groups of faces

Balint’s syndrome- can recognize objects but cannot navigate to reach for them. The subject cant reach for an object, he doesn’t
know where it is but knows what it is