Object Recognition and Face Recognition Flashcards Preview

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Flashcards in Object Recognition and Face Recognition Deck (36)
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1

Define object recognition

The ability to perceive an objects physical properties and apply semantic attributes

2

How do humans take in information?

Register large scale shapes and patterns AS QUICKLY AS small details

3

Mechelli et al (2004) said what about bottom up vs top down?

That's humans do bottom up first then top down

4

How do computers perceive objects?

They start with pixels (small details) "bottom up" and then build up

5

What are constancies?

What we see as the same, despite differences in dynamics

6

What's the context effect?

Some recognition requires an appreciation of context

7

What did Oliva & Torralba (2007) say about object recognition?

That objects in familiar context are recognised faster

8

What are the 5 steps to recognise an object?

1) see basic features
2) perceive organisation of features
3) perceive shape
4) compare shape to memory for knowledge
5) is the shape familiar, tap into knowledge

9

What is simultangnosia?

The inability to perceive how parts fit together

10

List the 3 models of object recognition

1) Template Matching
2) Feature recognition
3) Structural theories

11

What is the template matching model?

When an individual compares the whole object to stored representations to find a match

12

What is the feature recognition model?

Rather than focusing on the whole shape, feature models break down into critical features

13

What's Selfridges (1959) pandemonium model? Which 3 model does it come under?

It's a metaphorical description of levels of processing patterns before the whole

Feature recognition model

14

What's Marr & Nishiharas (1978) model? And what 3 models does it come under?

There are 3 levels of object recognition

1) primal sketch (edges and contours)
2) 2.5D sketch (shading and textures)
3) 3D model

The feature recognition model

15

What 3 things happen for recognition to occur?

1) single model axis
2) component axes
3) 3D model match (top down processing)

16

What is the structural theory? Using RBC theory

Biederman's recognition by components theory (1987)

Objects consist of combinations of geons
Object recognition is viewpoint invariant

17

What's greebles good for, using concavity importance?

Explores regions of concavity importance.

When presented with Greebles, individuals remained viewpoint dependent when recognising one even after training

18

What's dynamics of vision?

Focus on perception of static images by static observer

19

What's motion perception?

To perceive moving objects we must be able to pick up changes in stimulus over brief time intervals and recognise object in different stimuli. Humans are good at this.

20

What 2 things do object recognition depend on?

Sensory info and prior expectation

21

What plays an important role in object recognition that isn't mentioned?

Context

22

What are the 4 challenges of object recognition?

Different classes of things recognised
From different angles
Partly occluded
Fully occluded

23

What 3 things make face recognition special?

The development
The configural processing
Mechanistic

24

What's "developmental" face recognition?

Newborns are orientated towards upright face stimuli
Tendency to disappear after a month then reappear again (nakamo et al, 2014)

25

List the 3 types of "configural processing". What is configural processing?

People respond faster when top and bottom of faces are unaligned, like they normally are.

1) first order relations that define faces
(2 eyes, nose, mouth)

2) holistic processing
(glueing features together into gestalt)

3) second order relations
(spacing among features)

26

What's a famous example of configural processing?

Thatcher illusion (Thompson 1980)

Inverted face in which eyes and mouth remain normal, preserve facial expressions better than truly inverted faces

27

What's "mechanistic"?

Special brain areas devoted to face processing

-fusiform face area (FFA)
- superior temporal sulcus (STS)
- occipital face area (OFA)

28

What is object agonist? Use an example

Trouble recognising objects

E.g. Oliver sacks (1985) thought his wife was a hat

29

Whats face agonist?

Trouble recognising faces

30

What's prosopagnosia?

Face blindness