This document discusses human and computer language processing. It begins by explaining how humans access their lexicon and grammar to comprehend speech and produce language. It then provides examples of syntactic processing difficulties and speech perception challenges. The rest of the document discusses various areas of computational linguistics, including computational phonetics, morphology, syntax, semantics, pragmatics, and sign language. It also lists some applications of computational linguistics such as machine translation and information retrieval.

1. LANGUAGE
PROCESSING:
HUMANS and
COMPUTERS

2. PSYCHOLINGUISTICS
linguistic performance
Syntactic
processing
comprehension
speech
production

3. when
we
speak
when
we
listen
We access the lexicon and
grammar to assign a
structure and meaning to
the sounds we hear
We access our lexicon to
find words
We use the rules of
grammar to construct
sentences & to produce
the sounds that expresses
the message

4. “ I quite agree with you, said the Duchess; “ and the
moral of that is- ‘Be what you seem to be’ – or, if
you’d like it more simply – ‘Never imagine yourself
not to be otherwise than what it might appear to
others….to be otherwise.’”
“I think I should understand that better,” Alice said
very politely, “if I had written down: but I can’t quite
follow it as you say it.”
* A perfectly grammatical sentence and yet it is hard to
understand.
Comprehension

5. Speech signal
can be described in physical or acoustic term.
Speech sound
Physically, a sound is
produced when there
is a disturbance in the
position of air
molecules.
Acoustic phonetics – is
concerned only with
speech sounds, all of
which can be heard by
the normal human ear.

6. Fundamental
frequency
Spectrograms/
voiceprints
pitch
intensity
TERMINOLOGIES
How fast the variation of the air
pressure occur
Fundamental frequency of the
sound when perceived
Loudness of the sound
Patterns of sounds

7. - difficulty of the listener to carve up
the continuous speech signal into meaningful units.
- difficulty to distinguish two
physically distinct instances of a sound are the same.
Speech Perception and
Comprehension
A sniggle blick is procking a slar.
Segmentation
problem
Lack of invariance
problem

8. Bottom-up and Top-
down Models

11. the process by which we obtain information about the
meaning and syntactic properties of a word from our
mental lexicon
The gypsy read the young man’s
palm for
palm for only a dollar.
Lexical access and
word recognition
Semantic
priming

12. syntactic and semantic relations among words and
phrases in a sentence
The warehouse fires…..
could continue in two ways:
1….were set by an arsonists
2….employees over sixty
After the child visited the doctor
prescribed a course of injections.
parsing
Syntactic processing
garden path
sentences

13. • AnotAnother example of processing difficulty
is a rewording of a Mother Goose poem.
Original form:
Rephrased
This is the dog that worried the cat that killed
rat ate the malt that lay in the house that Jack
built.
Jack built the house that the malt that the rat
that the cat that the dog worried killed ate lay
in.

14. Shadowing
task
Average shadower can do with a
delay of (500 ms)
Speech sound
Subjects are asked to repeat
what they hear as rapidly as
possible
Exceptionally good shadowers
can follow what is being said
only a syllable behind (300 ms)
Technique to study sentence
comprehension

15. starts with a speaker who produces an
acoustic signal that represents a thought ,
idea, or message to be conveyed to the
listener.
The hiring of minority faculty.
The firing of minority faculty.
big and fat pig and vat
Speech error
Speech production

16. blends
• produce part of one word and
part of another; selecting two or
more words instead of deciding between them
1. splinters/ blisters splisters
2. edited/annotated editated
3. a swinging/ hip chick a swip chick
Lexical selection

17. Spontaneous errors show that the rules of
morphology and syntax may also be applied when
we speak.
1. groupment instead of grouping
2. We swimmed in the pool.
3. An burly bird instead of an early bird
Application and
Misapplication of
Rules

18. nonlinguistic factors can be involved in
sometimes interfere with – linguistic processing.
1. He made hairlines
He made headlines.
2. It can deliver a large payroll.
It can deliver a large payload.
Nonlinguistic
Influences

19. COMPUTATIONAL
LINGUISTICS
Computational phonetics
and phonology
Computational
morphology
Computational syntax
Computational sign
language
Computational
semantics
Computational
pragmatics

20. • 20
• process of analyzing the speech signal
into it’s component phones and phonemes,
and producing in effect, a phonetic transcription of speech.
process of creating electronic signals that
simulate the phones and prosodic features of
speech and assemble them into words and phrases for
output to an electronic speaker.
Computational phonetics and
phonology
Speech
recognition
Speech
synthesis

21. •
converts written text into basic
units of the synthesizer. It translates the input
text into phonetic representation.
Text-to-speech

22. Difficulties:
1. The problem of words that spelled alike but
pronounce differently.
e.g.
She has read the book.
She will read the book.
2. Inconsistent spelling
e.g.
I take it you already know
Of tough and bough and cough and dough

23. Computational Morphology
The processing of word structures by computers.
Programmed to look for roots and affixes. All
words are placed into computer’s dictionary.
e.g.
walking - walk+ing fondness – fond+ness
e.g.
fax – faxes, fax’s, faxing, faxed, refax, faxable

24. Computational Syntax
Parser - is a computer program that attempts to
replicate a grammar to assign in a phrase structure
of words
Rules: S NP VP, NP Det N
e.g. The child found the kittens.
top-down parser – child found the kittens
bottom-up parser- The child
found,the, kittens

25. the representation of the meaning of
words and morphemes in the computer, as
well as the meanings derived from their
combinations.
• The computer tries to find concepts in its
semantic representation capabilities that fit
the words and structures of the input.
Computational Semantics

26. is the interaction of the “real world” with the
language system.
e.g.
He saw the boy with a bicycle.
He saw the boy with a telescope.
Computational Pragmatics

27. • Linguists are working on computer algorithms that
will recognize sign language much in the same way
that speech may be recognized.
Purpose:
1. To produce a dictionary of signs
2. To enable a computer to search through ASL videos
for a particular sign, just as search engine like
Google searches for certain key words in text
documents.
Computational Sign Language

28. • computer models of grammar
• Frequency analysis, concordances, and
collocations
• Computational lexicography
• Information retrieval and summarization
• Spell checkers
• Machine translation
• Computational forensic linguistics:
trademarks
interpreting legal terms
speaker identification
Application of Computational
Linguistics