week 6: pattern recognition Flashcards

1
Q

what is agnosia

A

impairment of object recognition ability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

how does agnosia work

A

people can recognise its an object but cant verablise it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what are intact for agnosia

A

processes such as colour, shape and motion perception are intact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

what did agnosia help us understand

A

recognising a whole object is more than just recognising its parts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what are the 2 cortical pathways for vision

A

ventral pathway
dorsal pathway

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

ventral pathway route

A

occipital to temporal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what does the ventral pathway do

A

processes info about object appearance and identity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is the ventral pathway important for

A

object perception

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what is the dorsal pathway

A

occipital to parietal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

what does the dorsal pathway do

A

processes spatial info about objects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is the dorsal pathway important for

A

guiding action

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is optic ataxia

A

intact object recognition

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what do people with optic ataxia do

A

inability to use visual info to guide action

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what part of the brain is optic ataxia associated with

A

associated with lesions in the dorsal pathway (typically in the parietal cortex)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what does face perception require

A

holistic processing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are the gestalt principles

A

similarity
closure
good continuation
proximity

17
Q

what is template-matching and feature analysis

A

we tend to recognise different stimuli as the same object irrespective of superficial variations

18
Q

what is feature analysis

A

a visual pattern is perceived as a combination of elemental features

19
Q

type of model looking at feature analysis

A

selfridges pandemonium model

20
Q

how do we recognise 3d objects

A

the same way we do for 2d, an object is first segmented into a set of basic sub-objects and then recognised as a pattern composed eg. broken up into smaller shapes

21
Q

what are the subobjects of an object called

22
Q

what happens if the 3D object is midsegment deletion

A

takes alot longer to recognise the object

23
Q

in centre surround receptive fields, what happens if the illumination is the centre

A

its inhibitory

24
Q

what happens if the illumination is of the surround for receptive fields

A

its excitatory

25
what is the grandma cell hypothesis
a hypothetical neuron which encodes and responds to a highly specific but complex stimulus
26
weaknesses of the grandmother cell hypothesis
the final percept of an object is coded by a single neuron. However, each neuron's firing is not so reliable. If that neuron is lost, our perception of the corresponding object would be lost
27
what are some other weaknesses of the grandmother cell hypothesis
perception of novel objects cannot be explained well flexibility of object recognition cannot be explained well
28
what is ensemble coding
object recognition results from the firing of an ensemble of cells eg. grandma is broken up into parts (hair, nose, glasses, dress)
29
what is really important to recognition
the context
30
what is phonemic restoration effect
a perceptual phenomenon where under certain conditions, sounds actually missing from a speech signal can be restored by the brain and may appear to be heard
31
when does phonemic restoration effect happen
occurs when missing phonemes in an auditory signal are replaced with a noise that would have the physical properties to mask those phonemes