Title: PSY 369: Psycholinguistics
1PSY 369 Psycholinguistics
- Language Comprehension
- Sentence comprehension
2Overview of comprehension
3 Comprehending sentences
The man hit the dog with the leash.
- Theory question
- How do we know which structure to build?
- Methodological question
- What methods can we use to help us answer
theoretical questions like these?
4Commonly used methods
- Remember, the output of comprehension processes
are internal mental events. What kinds of
measures have been used to test theories? - Cross-modal priming
- E.g., listen to a sentence, make a lexical
decision to a visually presented word - Comprehension measure
- Read a sentence/passage and then answer questions
about what you read (decision time, accuracy) - Measure how long people actually spend reading
- Line by line reading
- Word by word reading
- Using eye movement monitoring techniques
- Neuropsychological methods
- E.g., ERPs, fMRI
5Line-by-line
6Line-by-line
who lends you his umbrella
7Line-by-line
when the sun is shining
8Line-by-line
but wants it back
9Line-by-line
the minute it begins to rain.
10Line-by-line
- Problem
- Overall reading time for entire sentence or
phrase - need for more on-line measurements
- Timing on a smaller scope
- See effects at level of word
11Word-by-word
- A couple of methods
- RSVP (rapid serial visual presentation)
- Moving window
12Word-by-word
- RSVP (rapid serial visual presentation)
- Experimenter presents the sentence one word a
time. - Typically the experimenter controls the
presentation rate.
13Word-by-word
14Word-by-word
lie
15Word-by-word
can
16Word-by-word
travel
17Word-by-word
halfway
18Word-by-word
around
19Word-by-word
the
20Word-by-word
world
21Word-by-word
while
22Word-by-word
the
23Word-by-word
truth
24Word-by-word
is
25Word-by-word
putting
26Word-by-word
on
27Word-by-word
its
28Word-by-word
shoes.
29Word-by-word
30Word-by-word
- I xxxx xxxxx xxx xx xxxxxxxxx xxxxxxxxx xxxx xx
xxxxxxxxx.
31Word-by-word
- x have xxxx xxx xx xxxxxxxxx xxxxxxxxx xxxx xx
xxxxxxxxx.
32Word-by-word
- x xxxx never xxx xx xxxxxxxxx xxxxxxxxx xxxx xx
xxxxxxxxx.
33Word-by-word
- x xxxx xxxxx let xx xxxxxxxxx xxxxxxxxx xxxx xx
xxxxxxxxx.
34Word-by-word
- x xxxx xxxxx xxx my xxxxxxxxx xxxxxxxxx xxxx xx
xxxxxxxxx.
35Word-by-word
- x xxxx xxxxx xxx xx schooling xxxxxxxxx xxxx xx
xxxxxxxxx.
36Word-by-word
- x xxxx xxxxx xxx xx xxxxxxxxx interfere xxxx xx
xxxxxxxxx.
37Word-by-word
- x xxxx xxxxx xxx xx xxxxxxxxx xxxxxxxxx with xx
xxxxxxxxx.
38Word-by-word
- x xxxx xxxxx xxx xx xxxxxxxxx xxxxxxxxx xxxx my
xxxxxxxxx.
39Word-by-word
- x xxxx xxxxx xxx xx xxxxxxxxx xxxxxxxxx xxxx xx
education.
40Word-by-word
- A couple of methods
- RSVP (rapid serial visual presentation)
- Moving window
- Better, more on-line
- But, these measures are also a little bit
unnatural (especially RSVP) - e.g., Dont allow regressions (looking back)
41Eye-movements in reading
- One of the most common measures used in sentence
comprehension research is measuring Eye-movements
42How the eye works
- At its center is the fovea, a pit that is most
sensitive to light and is responsible for our
sharp central vision. - The central retina is cone-dominated and the
peripheral retina is rod-dominated.
43How the eye works
- Limitations of the visual field
- 130 degrees vertically, 180 degrees horizontally
(including peripheral vision - Perceptual span for reading 7-12 spaces
Clothes make the man. Naked people have little
or no influence on society.
44How the eye works
- Within the visual field, eye movements serve two
major functions - Saccades to Fixations Position target objects
of interest on the fovea - Tracking Keep fixated objects on the fovea
despite movements of the object or head
- Eye-movements in reading are saccadic rather than
smooth
Clothes make the man. Naked people have little
or no influence on society.
Clothes make the man. Naked people have little
or no influence on society.
Video examples 1 2 3 4 5
45Smooth Pursuit
- Smooth movement of the eyes for visually tracking
a moving object - Cannot be performed in static scenes
(fixation/saccade behavior instead)
46Saccades
- Saccades are used to move the fovea to the next
object/region of interest. - Connect fixations
- Duration 10ms - 120ms
- Very fast (up to 700 degrees/second)
- Ballistic movements (pre-programmed)
- About 150,000 saccades per day
- No visual perception during saccades
- Vision is suppressed
- Evidence that some cognitive processing may also
be suppressed during eye-movements (Irwin, 1998)
47Saccades
Without suppression
Move to here
With suppression
Move to here
Video example (around 5 min mark)
48Smooth Pursuit versus Saccades
- Saccades
- Jerky
- No correction
- Up to 700 degrees/sec
- Background is not blurred (saccadic suppression)
- Smooth pursuit
- Smooth and continuous
- Constantly corrected by visual feedback
- Up to 100 degrees/sec
- Background is blurred
49Fixations
- The eye is (almost) still perceptions are
gathered during fixations - 90 of the time the eye is fixated
- duration 150ms - 600ms
- In reading, the assumption is that the length of
fixation is correlated with amount/type of
processing being done at that point (on that
word, at that point in the syntactic parse)
Video examples 1 2 3 4 5
- Article/video (if I can get it to work)
- Raney, G. E., Campbell, S. J., Bovee, J. C.
(2014). Using Eye Movements to Evaluate the
Cognitive Processes Involved in Text
Comprehension. J. Vis. Exp. (83), e50780,
doi10.3791/50780.
50Measuring Eye Movements
- Purkinje Eye Tracker
- Laser is aimed at the eye.
- Laser light is reflected by cornea and lens
- Pattern of reflected light is received by an
array of light-sensitive elements. - Very precise
- Also measures pupil accommodation (switching
between looking far or close) - No head movements
51Measuring Eye Movements
- Video-Based Systems
- Infrared camera directed at eye
- Image processing hardware determines pupil
position and size (and possibly corneal
reflection) - Good spatial precision (0.5 degrees) for
head-mounted systems - Good temporal resolution (up to 500 Hz) possible
52 Eye movements in reading
The man hit the dog with the leash.
- Theory question
- How do we know which structure to build?
- Methodological question
- How can we use eye-movements to help us answer
the theoretical question
53Parsing
- The syntactic analyser or parser
- Main task To construct a syntactic structure
from the words of the sentence as they arrive - Main research question how does the parser make
decisions about what structure to build?
54 Eye movements in reading
The man hit the dog with the leash.
S
NP
N
det
The
man
55 Eye movements in reading
The man hit the dog with the leash.
S
NP
VP
V
N
det
The
man
hit
56 Eye movements in reading
The man hit the dog with the leash.
S
NP
VP
V
NP
NP
N
det
N
det
The
man
hit
dog
the
57 Eye movements in reading
The man hit the dog with the leash.
S
NP
VP
V
NP
NP
Modifier
N
det
N
det
The
man
hit
dog
the
58 Eye movements in reading
The man hit the dog with the leash.
S
NP
VP
V
NP
Instrument
NP
N
det
N
det
The
man
hit
dog
the
59Sentence Comprehension
- There are many examples of syntactic ambiguity
- A vast amount of research focuses on Garden path
sentences - A garden path sentence invites the listener to
consider one possible parse, and then at the end
forces him to abandon this parse in favor of
another.
The horse raced past the barn fell.
Actual Newspaper Headlines
- Juvenile Court to Try Shooting Defendant
- Red tape holds up new bridge
- Miners Refuse to Work after Death
- Retired priest may marry Springsteen
- Local High School Dropouts Cut in Half
- Panda Mating Fails Veterinarian Takes Over
- Kids Make Nutritious Snacks
- Squad Helps Dog Bite Victim
- Hospitals are Sued by 7 Foot Doctors
60Different approaches
- Immediacy Principle access the meaning/syntax of
the word and fit it into a syntactic structure - Serial Analysis (Modular) Build just one based
on syntactic information and continue to try to
add to it as long as this is still possible
61Sentence Comprehension
- The horse raced past the barn fell.
62Sentence Comprehension
- The horse raced past the barn fell.
S
VP
NP
V
raced
The horse
63Sentence Comprehension
- The horse raced past the barn fell.
S
VP
NP
V
PP
P
NP
raced
past
The horse
64Sentence Comprehension
- The horse raced past the barn fell.
S
VP
NP
V
PP
P
NP
raced
past
the barn
The horse
65Sentence Comprehension
- The horse raced past the barn fell.
S
VP
NP
V
PP
P
NP
raced
past
the barn
The horse
fell
66Sentence Comprehension
- The horse raced past the barn fell.
- raced is initially treated as a past tense verb
S
VP
NP
V
PP
P
NP
raced
past
the barn
The horse
67Sentence Comprehension
- The horse raced past the barn fell.
- raced is initially treated as a past tense verb
- This analysis fails when the verb fell is
encountered
S
VP
NP
V
PP
P
NP
raced
past
the barn
The horse
fell
68Sentence Comprehension
- The horse raced past the barn fell.
- raced is initially treated as a past tense verb
- This analysis fails when the verb fell is
encountered - raced can be re-analyzed as a past participle.
S
VP
NP
V
PP
P
NP
raced
past
the barn
The horse
fell
69Different approaches
- Immediacy Principle access the meaning/syntax of
the word and fit it into a syntactic structure - Serial Analysis (Modular) Build just one based
on syntactic information and continue to try to
add to it as long as this is still possible - Interactive Analysis Use multiple levels (both
syntax and semantics) of information to build the
best structure
70Different approaches
- Immediacy Principle access the meaning/syntax of
the word and fit it into a syntactic structure - Serial Analysis (Modular) Build just one based
on syntactic information and continue to try to
add to it as long as this is still possible - Interactive Analysis Use multiple levels (both
syntax and semantics) of information to build the
best structure - Parallel Analysis Build both alternative
structures at the same time - Minimal Commitment Stop building - and wait
until later material clarifies which analysis is
the correct one.
71A serial model
- Formulated by Lyn Frazier (1978, 1987)
- Build trees using syntactic cues
- phrase structure rules
- plus two parsing principles
- Minimal Attachment
- Late Closure
- Go back and revise the syntax if later semantic
information suggests things were wrong
72A serial model
- Minimal Attachment
- Prefer the interpretation that is accompanied by
the simplest structure. - simplest fewest branchings (tree metaphor!)
- Count the number of nodes branching points
The girl hit the man with the umbrella.
73Minimal attachment
S
8 Nodes
NP
VP
the girl
V
NP
Preferred
S
hit
NP
PP
NP
VP
the man
P
NP
the girl
V
NP
PP
with
the umbrella
hit
the man
P
NP
with
the umbrella
9 nodes
The girl hit the man with the umbrella.
74A serial model
- Late Closure
- Incorporate incoming material into the phrase or
clause currently being processed. - OR
- Associate incoming material with the most recent
material possible.
She said he tickled her yesterday
75Parsing Preferences .. late closure
S
Preferred
S
np
vp
np
vp
she
v
S'
adv
she
v
S'
said
np
vp
yesterday
said
np
vp
he
v
np
he
v
np
adv
tickled
her
tickled
her
yesterday
(Both have 10 nodes, so use LC not MA)
She said he tickled her yesterday
76Minimal attachment
(Rayner Frazier, 83)
The spy saw the cop with a telescope.
minimal attach
Build this structure first
non-minimal attach
Build this structure first
77Minimal attachment
(Rayner Frazier, 83)
The spy saw the cop with a revolver.
minimal attach
Build this structure first
non-minimal attach
Build this structure first
78MA
Non-MA
The spy saw the cop with the binoculars.. The
spy saw the cop with the revolver (Rayner
Frazier, 83)
lt- takes longer to read
79Interactive Models
- Other factors (e.g., semantic context,
co-occurrence of usage expectation) may provide
cues about the likely interpretation of a sentence
- The evidence examined by the lawyer
- The defendant examined by the lawyer
80Interactive Models
- Other factors (e.g., semantic context,
co-occurrence of usage expectation) may provide
cues about the likely interpretation of a sentence
- The evidence examined by the lawyer
- The defendant examined by the lawyer
A defendant can be examined but can also do
examining.
81Semantic expectations
- Other factors (e.g., semantic context,
co-occurrence of usage expectation) may provide
cues about the likely interpretation of a sentence
- Taraban McCelland (1988)
- Expectation
- The couple admired the house with a friend but
knew that it was over-priced. - The couple admired the house with a garden but
knew that it was over-priced.
82Semantic expectations
- The couple admired the house with a friend but
knew that it was over-priced. - The couple admired the house with a garden but
knew that it was over-priced.
The Non-MA structure may be favoured
83What about spoken sentences?
- All of the previous research focused on reading,
what about parsing of speech? - Methodological limits ear analog of
eye-movements not well developed - Auditory moving window
- Reading while listening
- Looking at a scene while listening
- Some research on use of intonation
84Intonation as a cue
- A Id like to fly to Davenport, Iowa on TWA.
- B TWA doesnt fly there ...
- B1 They fly to Des Moines.
- B2 They fly to Des Moines.
85Chunking, or phrasing
- A1 I met Mary and Elenas mother at the mall
yesterday. - A2 I met Mary and Elenas mother at the mall
yesterday.
86Phrasing can disambiguate
Mary Elenas mother
mall
I met Mary and Elenas mother at the mall
yesterday
One intonation phrase with relatively flat
overall pitch range.
87Phrasing can disambiguate
Elenas mother
mall
Mary
I met Mary and Elenas mother at the mall
yesterday
Separate phrases, with expanded pitch movements.
88Summing up
- Is ambiguity resolution a problem in real life?
- Yes (Try to think of a sentence that isnt
partially ambiguous) - Many factors might influence the process of
making sense of a string of words. (e.g. syntax,
semantics, context, intonation, co-occurrence of
words, frequency of usage, )