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9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?” removed for copyright reasons.
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Page 1: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

9.00 Introduction to PsychologyFall 2004

Professor Jeremy Wolfe

Perception and Attention Demonstrations

Image from “Where’s Waldo?” removed for copyright reasons.

Page 2: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

You can read these

words.

And these are

fine, too.

** ** ** ** **

Fixate on the ***Fixate on the ***

Page 3: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Some visual features seem to escapeSome visual features seem to escape the bottleneckthe bottleneck

Page 4: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Others

Don’t

Page 5: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

We think that there are about 12We think that there are about 12--1818 “basic feature” dimensions.“basic feature” dimensions.

Page 6: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a tilted line? Say “yes” or “no”Is there a tilted line? Say “yes” or “no” as fast as possibleas fast as possible

Page 7: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a tilted line? Say “yes” or “no”Is there a tilted line? Say “yes” or “no” as fast as possibleas fast as possible

Page 8: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a tilted line? Say “yes” or “no” asIs there a tilted line? Say “yes” or “no” as fast as possiblefast as possible

Page 9: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a tilted line? Say “yes” or “no”Is there a tilted line? Say “yes” or “no” as fast as possibleas fast as possible

Page 10: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Feature Search: A limited set of features support highlyefficient "parallel" search.

Set Size R

eact

ion

Tim

e (m

sec)

slopes = ~0 msec/item

Page 11: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a “T”? Say “yes” or “no” as fastIs there a “T”? Say “yes” or “no” as fast as possibleas possible

Page 12: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a “T”? Say “yes” or “no” as fastIs there a “T”? Say “yes” or “no” as fast as possibleas possible

Page 13: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a “T”? Say “yes” or “no” as fastIs there a “T”? Say “yes” or “no” as fast as possibleas possible

Page 14: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a “T”? Say “yes” or “no” as fastIs there a “T”? Say “yes” or “no” as fast as possibleas possible

Page 15: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

.

Many other searches are inefficient and seem to require serial deployment of attention from item to item.

Set Size R

eact

ion

Tim

e (m

sec)

40-60 msec/itemTarget absent

20-30 msec/itemTarget present

Page 16: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Is there a “Red Horizontal”?Is there a “Red Horizontal”?

Say “yes” or “no” as fast as possibleSay “yes” or “no” as fast as possible

Page 17: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Find theFind the red verticalred vertical

Give me all theGive me all the red itemsred itemsThe core idea of Guided SearchThe core idea of Guided Search

Page 18: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Find theFind the red verticalred vertical

Give me all theGive me all the verticalsverticalsGuided SearchGuided Search

Page 19: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Find theFind the red verticalred vertical

The intersection of those sets is a goodThe intersection of those sets is a good place to deploy attention.place to deploy attention.

Page 20: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

PreattentivePreattentive processesprocesses guideguide thethe deployment of attention.deployment of attention.

Guided SearchGuided Search

Page 21: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

BottomBottom--up guidance: Is there a “T”?up guidance: Is there a “T”?

Page 22: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

TopTop--down guidance: The “T” is red.down guidance: The “T” is red.

Page 23: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Why do we need attention?Why do we need attention?

What are those features doingWhat are those features doing before attention arrives?before attention arrives?

Page 24: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

The idea: Before selection,The idea: Before selection, features are loosely bundled intofeatures are loosely bundled into

objectsobjects

I am a red, green, vertical, horizontal, pointy object

Page 25: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Attention enables theAttention enables the bindingbinding ofof features intofeatures into recognizablerecognizable objectsobjects

It is a red, green, vertical,It is a red, green, vertical, horizontal, pointy objecthorizontal, pointy object

I am a “plus” with green vertical and red horizontal regions

Page 26: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

PreattentivePreattentive features arefeatures are bundledbundled intointo preattentivepreattentive object files.object files.

Attention is required toAttention is required to bindbindfeatures into recognizablefeatures into recognizable

objects.objects.

Find theFind the ““redred verticals”verticals”

Page 27: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Easy to find red verticalsEasy to find red verticals

Page 28: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Find t he 2 red vert ical lines

Hard to find red verticalsHard to find red verticals

Page 29: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

500

1000

1500

2000

2500

3000

Rea

ctio

n T

ime

(mse

c)

2 5 8 10 12 set size

Absent - 141 msec/itemPresent - 57 msec/item

Why is this “plus” search so inefficient?

Page 30: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Why guidance failsWhy guidance fails

One Object red & green

& vert . & hor

One Object red & green

& vert . & hor

Two Object s 1 -red & vert

& 2 -green & hor

Page 31: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Do things stay together onceDo things stay together once you bind them?you bind them?

Meet the dancing chickensMeet the dancing chickens

Page 32: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 33: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 34: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 35: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 36: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 37: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 38: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

How bad are you?How bad are you?

The “The “IsWasIsWas” Paradigm” Paradigm

Page 39: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

You can see all these red and green dots.

Does the cued dot change color?

Page 40: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”
Page 41: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

No

Page 42: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

No

Page 43: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Yes

Page 44: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

No

Page 45: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Basic color and form information are immediately available.

Why can’t you do the task?

Page 46: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 47: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 48: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 49: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 50: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 51: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

More Dots….Tell me the color that the highlighted dot IS

If the dot turns black, tell me the color that it WAS.

Page 52: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Results from a two-color version of the ISWAS exp.

PercentCorrect

40%

50%

60%

70%

80%

90%

back-12 back-8 back-4 unattended back-2

Page 53: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Results from a four-color version of the ISWAS exp.

Percent Correct

20%

back-12 back-8 back-4 unattended back-2

30%

40%

50%

60%

70%

80%

Page 54: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Visual Short Term Memory

How big is it?

Page 55: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Remember these

Page 56: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Did anything change?

Page 57: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Remember these

Page 58: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Did anything change?

Page 59: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Remember these

Page 60: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Did anything change

Page 61: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

How about now

Page 62: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Any change?

Page 63: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

What if we combine color, shape and orientation?

Page 64: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

What if we combine color, shape and orientation?

Note: That is 4 objects but 12 features.

Page 65: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

How much do weHow much do we reallyreally see?see?

Page 66: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Change Blindness:Change Blindness:

What are you really seeing right now?What are you really seeing right now?

Image of painting removed for copyright reasons.

Page 67: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

What changed?What changed?

Image of painting (slightly different than previous slide) removed for copyright reasons.

Page 68: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Go back

Page 69: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Change Blindness:

Low level visual transients attract attention.

Image of painting removed for copyright reasons.

Page 70: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

See?

Image of painting (slightly different than previous slide) removed for copyright reasons.

Page 71: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Why are we so bad at this?Why are we so bad at this?And why are surprised that we are so bad?And why are surprised that we are so bad?

Page 72: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

The answer lies in the architecture of visual processing.

Early Vision

Recognition of objects (and their color) starts when early visual processes feed a selective processing pathway.

Page 73: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

A selective pathway

Early V

V xper

with an attentional bottleneck

feeding object

recognition

and subsequent awareness

ision

isual e ience

Binding Recognition

The selective path

Page 74: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Access to the bottleneck is controlled by guiding representation.

Early V

V xper

ision

isual e ience

Binding Recognition

The selective path

Color

Size Motion Depth

etc.

Orientation The Guiding

Representation

Page 75: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

The selective pathway gives you the status of the current object of attention

Early V

V xper

That is the single pathway story

ision

isual e ience

Binding Recognition

The selective path

Color

Size Motion Depth

etc.

Orientation The Guiding

Representation

Page 76: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

What is the status of the current object of

attention?

Visual Experience

But where does theBut where does the rest of therest of the

experience comeexperience come from?from?

Page 77: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Early V

A non-selective pathway can fill in the rest of the experience

V xper

ision

Binding Recognition

The selective path

Color

Size Motion Depth

etc.

Orientation The Guiding

Representation

isual e ience

Page 78: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Early Vision

Different pathways, Different functions

Object recognition

Minimal semantic analysis

Texture statistics

Feature binding

Ambient visual experience

Focal visual experience

Binding Recognition

The selective path

Page 79: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Relationship to otherRelationship to other things you knowthings you know

Brain structure diagram removed for copyright reasons.

Remember the WhatRemember the What vsvs Where idea?Where idea?

Page 80: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

“Selective” would be the “What” pathway.

Early V

V xper

ision

isual e ience

Binding Recognition

The selective path

Color

Size Motion Depth

etc.

Orientation The Guiding

Representation

Page 81: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Lesion yields agnosia.

Page 82: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Early V

Non-selective pathway would map onto the “Where” pathway.

ision

Page 83: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

Would a lesion yield simultagnosia?

Page 84: 9.00 Introduction to Psychology Fall 2004 …...9.00 Introduction to Psychology Fall 2004 Professor Jeremy Wolfe Perception and Attention Demonstrations Image from “Where’s Waldo?”

And a lesion of guidance?

Problems with visually directed action?


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