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Scene perception after those first few hundred milliseconds
Jeremy WolfeBrigham and Women's Hospital and Harvard
Medical School
The constructive view of scene perception
The constructive view of scene perception
The constructive view of scene perception
The constructive view of scene perception
Appealing…but wrong
The transient binding view of scene perception
The transient binding view of scene perception
The transient binding view of scene perception
The transient binding view of scene perception
The transient binding view of scene perception
The transient binding view of scene perception
If you want to know what is here
?
You will have to check
What is the evidence for this claim? The repeated search task
• The capital letters are the search array.
• The lower case letter at the center tell you what to look for on this trial.
• In repeated search, the search array does not change from trial to trial.
A B
D F
Y
a
G
A B
D F
Y
f
G
A B
D F
Y
h
G
A B
D F
Y
y
G
K
T
VR
E e
Repeated Search
K
T
VR
E c
Repeated Search
K
T
VR
E t
Repeated Search
K
T
VR
E r
Repeated Search
K
T
VR
E a
Repeated Search
TA
Q
B G
b
TA
Q
B G
f
TA
Q
B G
p
TA
Q
B G
t
Repeated Search
TA
Q
B G
bF J
S
R V
f
ZVH
B N
pM S
L
TE
t
Standard Search
TA
Q
B G
f p t
Memory Search
1 2 3 350
1 2 3 350
1 2 350
Slope of the RT x set size function is the measure of search efficiency
- 2 0
0
2 0
4 0
6 0
8 0
0 1 0 0 2 0 0 3 0 0
R e p e a t e d s e a r c h i s u p a t t h e “ c e i l i n g ”
C E I L I N G
R E P E A T E D S E A R C H
T r i a l n u m b e r
SLOPE
- 2 0
0
2 0
4 0
6 0
8 0
0 1 0 0 2 0 0 3 0 0
M e m o r y s e a r c h i s a c t u a l l y m o r e e f f i c i e n t
M E M O R Y S E A R C H
C E I L I N G
R E P E A T E D S E A R C H
T r i a l n u m b e r
SLOPE
Repeated
Unrepeated
Memory
100 200 300 400 500
Trials
20
40
60
80
100
Slopemsec/item
Actually, only 2AFC memory search is efficient
Localization responses
Melina Kunar’s mouseclick experiments. (Kunar, Flusberg, & Wolfe)
But this is a meeting about scenes
So Aude and I did a version with scenes like this
Same basic result
Note: Mean RT is faster, but search efficiency is unchanged.
Repeated
Unrepeated
We also did “panoramic” search
Panorama Experiments
Panorama Experiments
Panorama Experiments
Panorama ExperimentsPanorama Experiments
Panorama Experiments
Panorama ExperimentsPanorama Experiments
Panorama Experiments
You can search for a visible target
You still get a slope
If the same target is hidden
The slope can vanish
Subjects make a pragmatic choice
Search if the target is visible
The “IsWas” Paradigm
Minimal Change Blindness
Behold, I bring you a mystery.
Does the cued dot change color?
No
No
Yes
No
Early Vision
So…to summarize
A selective pathway
Early Vision
Visual experience
BindingRecognitionThe selective path
with an attentional bottleneck
feedingobject
recognition
andsubsequent awareness
Access to the bottleneck is controlled by guiding representation.
Early Vision
Visual experience
BindingRecognitionThe selective path
ColorSizeMotionDepthetc.
OrientationThe Guiding
Representation
Early Vision
BindingRecognitionThe selective path
ColorSizeMotionDepthetc.
OrientationThe Guiding
Representation
A non-selective pathway can fill in the rest of the experience
Visual experience
