Recognition

Question 1

Object recognition is used in a variety of tasks including:

1.

2.

4.

Answer 1

1. to recognize a particular type of object (a moose)
2. a particular exemplar (this moose)
3. to recognize it (the moose I saw yesterday)
4. to match it (the same as that moose)

Question 2

A match between visual input and a mental representation of an object is called _________.

Answer 2

recognition

Question 3

what are three recognition themes?

Answer 3

1. Category specificity (faces and places)
2. Nature of representation (2D or 3D)
3. Perceptual organization (grouping and segmentation)

Question 4

What is prosopagnosia?

Answer 4

AKA: Face Blindness

Question 5

What is object agnosia?

Answer 5

People who cannot recognize common objects but have no trouble with faces.

(People can describe pictures/objects verbally but cannot name them correctly)

Question 6

What does the face inversion effect suggest?

Answer 6

It suggests that upright faces are processed differently.

Question 7

What did the face selectivity in IT experiment show?

Answer 7

Exp: Panel of plots that show response to an IT neuron (firing rate over time) in response to each of the pictures.

IT SHOWS STRONG RESPONSE TO FACES.

FROM weak to strongest

Srambled features randomly–>blank out eyes–> blank out mouth–> hand–> remove color from picture–> Bob Desimone’s face–> monkey face

Question 8

What is said about reading and face recognition?

Answer 8

Letter recognition is, like face recognition, believed to be handled by special-purpose circuitry in the brain.

Question 9

What are geons?

Answer 9

Geons (geometric ions) are simple 3-dimensional forms such as spheres, cubes, cylinders, cones, or wedges. One often-cited[1] theory of object recognition, Biederman’s “Recognition by Components Theory” (RBC)[2] proposes that visual input is matched against structural representations of objects in the brain. These structural representations consist of geons and their interrelations (e.g., an ice cream cone could be broken down into a sphere located above a cone)

Question 10

Name the two contributors to perceptual organization:

1.

2.

Answer 10

Segmentation- divide the visual field into distinct parts/objects.

Grouping- integrate visual information across different patches (filling in the missing parts).

Question 11

When the visual system can only process a modest number of features. If there are too many features then it can’t cope and fails to recognize anything.

Answer 11

CROWDING

Question 12

what promotes perceptual grouping?

Answer 12

1. Similarity
2. Proximity
3. Common region
4. Good continuation
5. Symmetry
6. Closure
7. Common fate/ temporal structure