overview. biology and basic representations. distributed ... · past gain loss fact role stay hire...
TRANSCRIPT
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Language
1 Overview.2 Biology and Basic Representations.3 Distributed Lexicon & Dyslexia.4 Reading & Past Tense.5 Semantics & Sentences.
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Overview of Models
Distributed lexicon (ortho, phono, sem): reading & dyslexia.
Orthography to phonology in reading: regularities andexceptions.
Semantics to phonology and past tenseoverregularizations.
Semantic representations from word co-occurrences.
Sentence-level processing and the sentence gestalt.
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Biological Substrates of Language
teethlips
tongue
phar
anx
hard palatevelum(soft palate)
nasal cavity
alveolarridge
epiglottis
glottis(vocal cords)
uvula Broca’s Wernicke’s
Frontal Parietal
Occ
ipita
l
Temporal
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Phonology Features: Vowels
<- front | back ->1 2 3 4 5 6 7
ˆ +---------------------+u 1 E--A_ Up 2 \ i --\ u |__hi_ˆ__
3 e \ --Y-- / Od \ \ \-/ |o 4 \ \ ˆ / \--ow 5 @ -I- W |__lo_v__n \ \ / |v 6 ----- a ------+
round/flat, long/short
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Phonology Features: Consonants
place: labial, labio-dental, dental, alveolar, palatal, velar, glottal
manner: plosive, fricative, semi-vowel, liquid, nasal
vocalized, not vocalized
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Distributed Lexicon Model & Dyslexias
Orthography Phonology
Semantics
Hidden Hidden
Hidden
Phonological: nonwords (“nust”) impaired.
Deep: phono + semantic errors (“dog” as “cat”) +visual errors (“dog” as “dot”).
Surface: nonwords OK + semantic access impaired +difficulty reading exception words (“yacht”) + visualerrors.
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The Model
t w y
a d e g k n r s
i l n o p r s v
l o r t a c e g
p r s t w a e i
c d e f g h l n
OS_Hid
Semantics
SP_Hid
w
s t
p r
l n
h k
f g
− d
t w
p r
l n
h k
f g
− d
t w
p r
l n
h k
f g
− d
i o
a e
O U
E I
@ A
z
t v
r s
n p
k l
g j
− d
z
t v
r s
n p
k l
g j
− d
z
t v
r s
n p
k l
g j
− d
Orthography OP_Hid Phonology
Cleanup self-connections.7 / 33
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Corpus and SemanticsConcrete/Abstract Semantics
Y
X0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
0.00 10.00 20.00 30.00 40.00
tentflea
lassfacegrin
wavereedloon
haredeerhind
tartflan
pleahint
planflaw
lackneed
deedtactease
pastgainloss
factrole
stayhire
loanrent
costwage
ropepostlockcase
starcoatflag
20 concrete (more features), 20 abstract.8 / 33
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Simulating DyslexiaLayer(s) lesioned Dyslexia TypeComp Sem SurfaceComp Dir DeepOSHid SurfaceSP Hid SurfaceOPHid PhonoOSHid + Comp Dir DeepSP Hid + Comp Dir DeepOPHid + Comp Sem Surface
Orthography Phonology
Semantics
Hidden Hidden
Hidden
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Semantic Pathway Lesions, Intact Direct
0.0 0.2 0.4 0.6 0.8Lesion Proportion
05
101520
Err
ors
VisualVis + SemSemanticBlendOther
05
101520
Err
ors
0.0 0.2 0.4 0.6 0.8Lesion Proportion
Concrete Abstract
OS_Hid
SP_Hid SP_Hid
OS_Hid
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Semantic Pathway Lesions, Lesioned Direct
0.0 0.2 0.4 0.6 0.8Lesion Proportion
05
101520
Err
ors
VisualVis + SemSemanticBlendOther
05
101520
Err
ors
0.0 0.2 0.4 0.6 0.8Lesion Proportion
Concrete Abstract
OS_Hid
SP_Hid SP_Hid
OS_Hid
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Direct Pathway Lesion
0.0 0.2 0.4 0.6 0.8Lesion Proportion
05
101520
Err
ors
VisualVis + SemSemanticBlendOther
05
101520
Err
ors
0.0 0.2 0.4 0.6 0.8Lesion Proportion
Concrete Abstract
Full Sem Full Sem
No Sem No Sem
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Language II: Reading and Past Tense
1 Reading.2 Past Tense.
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Reading: Regularities & Exceptions
Regularities in pronunciation are often partial, contextdependent:i in mint, hint.. vs mind, find.. except: pint
Exceptions are extreme of context dependent.
Seidenberg & McClelland (1989) used extremely contextdependent wickelfeatures: _think_ = _th , thi , hin , ink ,and nk_
PMSP used hand-coded context independent inputs (+ someconjunctions).
Need a range of context dependency for regulars andexceptions.
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Reading as Object Recognition
Tradeoff between dependence & independence similar to objectrecognition: need invariance but also need to bind features.
words...words
worw
orrds d
hidden
phonemes
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Reading Model
Ortho
Ortho_Code
Hidden
Phon
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Nonword Performance
Regularity tests (Glushko): bint→ /bint/
Pseudo-homophones (McCann & Besner):phoyce→ /fYs/, choyce→ /CYs/
Matched regularity/exception cases (Taraban):High freq: poes→ /pOz/, goes→ /gOz/, does→ /dˆz/Low freq: mose→ /pOs/, poes→ /pOz/, lose→ /lUz/
Nonword Set Model PMSP PeopleGlushko regulars 95.3 97.7 93.8Glushko exceptions raw 79.0 72.1 78.3Glushko exceptions alt OK 97.6 100.0 95.9McCann & Besner ctrls 85.9 85.0 88.6McCann & Besner homoph 92.3 n/a 94.3Taraban & McClelland 97.9 n/a 100.01
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Past Tense
Simple production model: semantics to phonology, withinflections:
Semantics
Phonology
pasttense
ed
(strong correlation)
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Past Tense: U-Shaped Curve
This is the interesting target developmental phenomenon:
2 3 4 5 6 7 8 9 10Years of Age
0.90
0.92
0.94
0.96
0.98
1.001−
Ove
rreg
Rat
eOverregularization in Adam
Eventualcorrect
performanceassumed
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U-Shaped History
Initially: overzealous rule usage.
Then: Rumelhart & McClelland, U-shaped curve based onnetwork processing of regularities. BUT: trained irregulars first,then regs.
(much controversy ensues)
Later: Plunkett et al., etc, manipulate enviro in graded way.
Problem: backprop is gradient descent!
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U-Shaped Model in Leabra
Competition & Hebbian learning produce network that is indynamic balance between reg & irreg mappings.
Small tweaks can shift it one way or the other! (priming model).
Hebbian sensitivity to correlational regularity.
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The Past Tense Model
Semantics
Hidden
Phonology
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The Past Tense Model
Inflection Reg sfx Regular/Irregular examples
Base – I walk to the store daily.I go to the store daily.
Past -ed I walked to the store yesterday.I went to the store yesterday.
3rd pers sing -s She walks to the store daily.She goes to the store daily.
Progressive -ing I am walking to the store now.I am going to the store now.
Past participle -en I have walked to the store before.I have gone to the store now.
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Past Tense Results
0 25000 50000 75000Number of Words
0.0
0.2
0.4
0.6
0.8
1.0
1−O
R, R
espo
nses
Overregularization in Bp
ORResponses
b)
a)
0 25000 50000 75000Number of Words
0.0
0.2
0.4
0.6
0.8
1.0
1−O
R, R
espo
nses
Overregularization in Leabra
ORResponses
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Past Tense Results
Bp L H0 L H001 L H0050
25
50
75
100
Res
pons
es
Early Correct Responding
To 1st ORTo 2nd OR Bp L H0 L H001 L H005
0
50
100
150
200
Ove
rreg
ular
izat
ions
Total Overregularizations
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Language III: Semantics and Sentences
1 Semantics.2 Sentences.
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Distributed Semantics
orthography phonology
action oriented
tactile
visual
auditory
kinestheticform
color
3−D
telephonefoot
brake
kettle
velv
et
cloudsthunder
Semantics is distributed across specialized processing areas.27 / 33
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Model: Correlational Semantics
Use Hebbian learning to encode structure of wordco-occurrence.
Same idea as:
V1 receptive field learning: learn the strong correlations.
Latent Semantic Analysis (LSA) (but avoids “blobs” ofPCA).
Input
Hidden
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Sentences
Traditional approach:S
(subject)
Art N
The boy
V NP(direct object)
chases the cats
NP VP
Alternative approach:
Distributed reps of sentence meaning: The sentence Gestalt!
Parallel to object recognition issues: 3D structural model vs.distributed reps that distinguish different objects.
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Toy World
People: busdriver (adult male), teacher (adult female),schoolgirl, and pitcher (boy).
Actions: eat, drink, stir, spread, kiss, give, hit, throw, drive, rise.
Objects: spot (the dog), steak, soup, ice cream, crackers, jelly,iced tea, kool aid, spoon, knife, finger, rose, bat (animal), bat(baseball), ball, ball (party), bus, pitcher, and fur
Locations: kitchen, living room, shed, and park.
Syntax: Active & Passive, phrases.
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Network
Input
Encode
Gestalt Gestalt Context
Decode
Role Filler
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Tests
Task SentenceRole assignment
Active semantic The schoolgirl stirred the kool-aid with a spoon.Active syntactic The busdriver gave the rose to the teacher.Passive semantic The jelly was spread by the busdriver with the knife.Passive syntactic The teacher was kissed by the busdriver.(control) The busdriver kissed the teacher.
Word ambiguity The busdriver threw the ball in the park.The teacher threw the ball in the living room.
Concept instantiation The teacher kissed someone (male).Role elaboration The schoolgirl ate crackers (with finger).
The schoolgirl ate (soup).Online update The child ate soup with daintiness.
(control) The pitcher ate soup with daintiness.Conflict The adult drank iced-tea in the kitchen (living-room).
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Gestalt Representations
SG Gestalt PatternsY
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0.00 2.00 4.00 6.00 8.00
sc_at_so.
bu_at_so.
te_at_so.
pi_at_so.
sc_at_st.
bu_at_st.
te_at_st.
pi_at_st.
pi_dr_ic.
sc_dr_ic.
bu_dr_ic.
te_dr_ic.
pi_st_ko.
bu_st_ko.
te_st_ko.
sc_st_ko.
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