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PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors
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PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Dec 19, 2015

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Page 1: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

PSY 369: Psycholinguistics

Language Production:Experimentally elicited speech errors

Page 2: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Your speech error collections How did it go? What interesting things did you notice? What difficulties did you encounter? Etc.

Page 3: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Problems with speech errors Not an on-line technique. We only remember (or notice) certain types of errors. People often don’t (notice or) write down errors which

are corrected part way through the word, e.g. “wo..wring one”.

Page 4: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Even very carefully verified corpora of speech errors tend to list the error and then “the target”.

However, there may be several possible targets. Saying there is one definitive target may limit conclusions

about what type of error has actually occurred. Evidence that we are not very good at perceiving

speech errors.

Problems with speech errors

Page 5: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

How well do we perceive speech errors? Ferber (1991)

Method: Transcripts of TV and radio were studied very carefully

to pick out all the speech errors.

Problems with speech errors

Did you hear what he said?!

The tapes were played to subjects whose task was to record all the errors they heard.

The errors spotted by the subjects were compared with those that actually occurred.

Page 6: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

How well do we perceive speech errors? Ferber (1991)

Problems with speech errors

Results: Subjects missed 50% of all the errors And of the half they identified

50% were incorrectly recorded (i.e. only 25% of speech errors were correctly recorded).

Conclusion: We are bad at perceiving errors.

Page 7: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Experimental speech errors Can we examine speech errors in under more

controlled conditions? SLIP technique: speech error elicitation technique

Motley and Baars (1976)

Page 8: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Say the words silently as quickly as you canSay them aloud if you hear a ring

Page 9: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

dog bone

Page 10: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

dust ball

Page 11: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

dead bug

Page 12: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

doll bed

Page 13: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

barn door

“darn bore”

Page 14: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

• This technique has been found to elicit 30% of predicted speech errors.

• Lexical Bias effect: error frequency affected by whether the error results in real words or non-words

Experimental speech errors

“wrong loot” FOR “long root”

“rawn loof” FOR “lawn roof “

Some basic findings

More likely

Page 15: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Influence of semantics (Motley, 1980)

Experimental speech errors

Hypothesis: If preceded by phonologically and semantically

biasing material (PS) If preceded by only phonologically biasing material

(P).

Some basic findings

Predicted to be more likely

Page 16: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Influence of semantics (Motley, 1980)

Experimental speech errors

Method: 2 matched lists 20 word pairs as targets for errors

e.g. bad mug mad bug Each preceded by 4 - 7 neutral “filler”

word pairs

Some basic findings

mashed bunsmangy bears

Then 4 interference word pairs 2 phonological PLUS

2 semantic (SP)

angry insect

ornery fly

angled inset

older flu

or semantically neutral controls (P)

bad mug

small catsrainy daysred cars

Page 17: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results: More errors in the Semantic and Phonological (SP) condition than in the Phonological (P) condition.

Conclusion: Semantic interference may contribute to a distortion of the

sound of a speaker’s intended utterance

Experimental speech errors

Influence of semantics (Motley, 1980)

Some basic findings

Page 18: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Freudian slips The psycholinguistic approach

Assume that “the mechanics of slips can be studied linguistically without reference to their motivation.” (Boomer and Laver, 1968)

Freudian approach Held that speech errors “arise from the concurrent action - or

perhaps rather, the opposing action - of two different intentions”

Intended meaning + disturbing intention speech error

Page 19: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Freudian slips“In the case of female genitals, in spite of many

versuchungen [temptations] - I beg your pardon, versuche [experiments]…”

From a politician “I like Heath. He’s tough - like Hitler - (shocked silence from reporters) - Did I say Hitler? I meant Churchill.”

Are these cases of disturbing intentions or merely cases of lexical substitution (phonologically or semantically related words)?

Page 20: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Freudian slips

Of the 94 errors listed in Psychopathology of Everyday Life 85 were made in normal speech.

Ellis, (1980)

51 (60%) involved lexical substitution in which the substituting word was either similar in phonological form (27) to the intended word or related in meaning (22).

Page 21: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Freudian slips

Of the 94 errors listed in Psychopathology of Everyday Life 85 were made in normal speech.

Ellis, (1980)

Only 10/94 of the errors reported by Freud were spoonerisms, and 4 were from Meringer and Mayer, 1895 (an early, linguistically oriented study).

E.g. Eiwess-scheibchen (“small slices of egg white”) Eischeissweibchen (lit. “egg-shit-female”)

Alabasterbüchse (“alabaster box”) Alabüsterbachse (büste = breast)

Page 22: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Freudian slips

Hence, it appears that “Freud’s theory can be translated into the language of modern psycholinguistic production models without excessive difficulty.”

Ellis, (1980)

Page 23: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Experimental Freudian slips? Motley & Baars (1979)

Hypothesis: Spoonerisms more likely when the resulting content is congruous with the situational context.

Method: 90 males, same procedure previously used by Motley, 1980 (SLIP).

3 Conditions: “Electricity” - expecting to get shocked “Sex” - researcher provocatively attired female Neutral

Page 24: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Same word pairs in all conditions spoonerism targets were non-words (e.g. goxi furl

foxy girl), targets preceded by 3 phonologically biasing word pairs not semantically related to target words

Some resulting errors were sexually related (S), some were electrically related (E)

Bine foddy -> “fine body” Had bock -> “bad shock”

Experimental Freudian slips?

Page 25: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.
Page 26: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

car tires

Page 27: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

cat toys

Page 28: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

can tops

Page 29: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

cup trays

Page 30: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

tool kits

“cool tits”

Page 31: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results (number of errors, by type): Electricity set: 69 E, 31 S Sex set: 36 E, 76 S Neutral set: 44 E, 41 S

Hence errors were in the expected direction. Conclusion: subjects’ speech encoding systems are

sensitive to semantic influences from their situational cognitive set.

Experimental Freudian slips?

Page 32: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Hypothesis: subjects with high levels of sex anxiety will make more “sex” spoonerisms than those with low sex anxiety.

Method: 36 males selected on the basis of high, medium, & low sex

anxiety (Mosher Sex-Guilt Inventory). SLIP task same as previous experiment but with 2 additional

Sex targets and 9 Neutral targets.

Experimental Freudian slips?

Page 33: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results: looked at difference scores (Sex - Neutral) High sex anxiety > medium > low. Overall: Sex spoonerisms > Neutral spoonerisms.

Conclusion: appears to support Freud’s view of sexual anxiety being revealed in Slips of the Tongue

BUT: the experimenters (Baars and Motley) went on to show that any type of anxiety, not just sexual produced similar results.

SO: anxiety was at play but it was more general, so the priming

was more global.

Experimental Freudian slips?

Page 34: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

Jane threw the ball to Bill

What do speech errors suggest? Productivity & Units Advanced planning

Page 35: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conclusions Speech errors have provided data about the

units of speech production.

Phonology - consonants, vowels, and consonant clusters (/fl/) can be disordered as units. Also, phonetic features.

Syllables which have morphemic status can be involved in errors. Separation of stem morphemes from affixes (inflectional and derivational).

Stress? Stress errors could be examples of blends.

Page 36: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conclusions

Syntax -grammatical rules may be applied to the wrong unit, but produce the correct pronunciation (e.g. plural takes the correct form /s/, /z/, or /iz/.

Indicates that these parts of words are marked as grammatical morphemes.

Phrases (e.g. NP) and clauses can be exchanged or reversed.

Words - can exchange, move, or be mis-selected.

Speech errors have provided data about the units of speech production.

Page 37: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech Propositions to be communicatedMessage level

Morphemic level

Syntactic level

Phonemic level

Articulation

Selection and organization of lexical items

Morphologically complex words are constructed

Sound structure of each word is built

Page 38: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech Propositions to be communicatedMessage level

Syntactic level

Morphemic level

Phonemic level

Articulation

Not a lot known about this step Typically thought to be shared with

comprehension processes, semantic networks, situational models, etc.

Page 39: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech Grammatical class constraint

Most substitutions, exchanges, and blends involve words of the same grammatical class

Slots and frames A syntactic framework is constructed, and

then lexical items are inserted into the slots

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Page 40: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

It was such a happy moment when Ross kissed Rachel…

Ross

Emily

Rachel

Page 41: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

… Oops! I mean “kissed Emily.”

Ross

Emily

Rachel

Page 42: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

LEXICON

•ROSS

•KISS

•EMILY

•RACHEL

SYNTACTIC FRAME

NP

S

VP

V(past) NN

Spreading activation

Page 43: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

LEXICON

•ROSS

•KISS

•EMILY

•RACHEL

SYNTACTIC FRAME

NP

S

VP

V(past) NN

Grammatical class constraint:

If the word isn’t the right grammatical class, it won’t “fit” into the slot.

Page 44: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech Grammatical class constraint

Most substitutions, exchanges, and blends involve words of the same grammatical class

Slots and frames Other evidence

Syntactic priming

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Page 45: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Hear and repeat a sentence

Describe the picture

Bock (1986): syntactic persistance tested by picture naming

Syntactic priming

Page 46: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

a: The ghost sold the werewolf a flowerb: The ghost sold a flower to the werewolf

Bock (1986): syntactic persistance tested by picture naming

Syntactic priming

b: The girl gave the flowers to the teacher

a: The girl gave the teacher the flowers

Page 47: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Syntactic priming In real life, syntactic priming seems to

occur as well Branigan, Pickering, & Cleland (2000):

Speakers tend to reuse syntactic constructions of other speakers

Potter & Lombardi (1998): Speakers tend to reuse syntactic constructions of

just read materials

Page 48: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

The inflection stayed in the same location, the stems moved

Inflections tend to stay in their proper place

Do not typically see errors like

The beeing are buzzesThe bees are buzzing

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Stranding errors

I liked he would hope you

I hoped he would like you

Page 49: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

Closed class items very rare in exchanges or substitutions

Two possibilities Part of syntactic frame High frequency, so lots of practice,

easily selected, etc.

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Stranding errors

Page 50: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Consonant vowel regularity Consonants slip with other

consonants, vowels with vowels, but rarely do consonants slip with vowels

The implication is that vowels and consonants represent different kinds of units in phonological planning

Page 51: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Consonant vowel regularity Frame and slots in syllables

Similar to the slots and frames we discussed with syntax

Page 52: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

LEXICON

•/d/, C

•/g/, C

• , VOnset

Word

Rhyme

V CC

PHONOLOGICAL FRAME

Syllable

Page 53: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech

Message level

Syntactic level

Morphemic level

Phonemic level

Articulation

Consonant vowel regularity Frame and slots in syllables Evidence for the separation of meaning

and sound

Tip of the tongue Picture-word interference

Page 54: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Uhh…It is a.. You know.. A.. Arggg.I can almost see it, it has two

Syllables, I think it starts with A …..

TOT Meaning access No (little) phonological

access What about syntax?

Tip-of-the-tongue

Page 55: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

“The rhythm of the lost word may be there without the sound to clothe it; or the evanescent sense of something which is the initial vowel or consonant may mock us fitfully, without growing more distinct.” (James, 1890, p. 251)

Tip-of-the-tongue

Page 56: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Low-frequency words (e.g., apse, nepotism, sampan), prompted by brief definitions.

On 8.5% of trials, tip-of-the-tongue state ensued:

Had to guess: word's first or last letters the number of syllables it contained which syllable was stressed

Brown & McNeill (1966)

Tip-of-the-tongue

Page 57: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Total of 360 TOT states: 233 ="positive TOTs" (subject was thinking of target

word, and produced scorable data 127 = "negative TOTs" (subject was thinking of other

word, but could not recall it) 224 similar-sound TOTs (e.g., Saipan for sampan)

48% had the same number of syllables as the target 95 similar-meaning TOTs (e.g., houseboat for

sampan). 20% had same number of syllables as target. 

Tip-of-the-tongue Brown & McNeill (1966)

Page 58: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Similar words come to mind about half the time but how much is just guessing?

First letter: correct 50-71% of time (vs. 10% by chance) First sound: 36% of time (vs. 6% by chance)

Tip-of-the-tongue

Page 59: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results suggest a basic split between semantics/syntax and phonology: People can access meaning and grammar

but not pronunciation

Tip-of-the-tongue

Page 60: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Semantics Syntax

grammatical category (“part of speech”) e.g. noun, verb, adjective

Gender e.g. le chien, la vache; le camion, la voiture

Number e.g. dog vs. dogs; trousers vs. shirt

Count/mass status e.g. oats vs. flour

Tip-of-the-tongue

Page 61: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Vigliocco et al. (1997) Subjects presented with word definitions

Gender was always arbitrary If unable to retrieve word, they answered

How well do you think you know the word? Guess the gender Guess the number of syllables Guess as many letters and positions as possible Report any word that comes to mind

Then presented with target word Do you know this word? Is this the word you were thinking of?

Tip-of-the-tongue

Page 62: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Vigliocco et al (1997)

Scoring + TOT

Both reported some correct information in questionnaire

And said yes to recognition question - TOT

Otherwise

Vigliocco et al. (1997)

Page 63: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Vigliocco et al (1997)

Results + TOT: 84% correct gender guess - TOT: 53% correct gender guess

chance level Conclusion

Subjects often know grammatical gender information even when they have no phonological information

Supports split between syntax and phonology in production

Vigliocco et al. (1997)

Page 64: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

MODELS OF PRODUCTION As in comprehension, there are serial (modular) and

interactive models Serial models - Garrett, Levelt et al. Interactive models - Stemberger, Dell

Levelt’s monitoring stage (originally proposed by Baars) can explain much of the data that is said to favour interaction between earlier levels

Page 65: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Doing it in time Strongest constraint may be fluency:

Have to get form right under time pressure.

Incrementality: ‘Work with what you’ve got’ Flexibility: allows speaker to say something quickly, also

respond to changing environment.

Modularity: ‘Work only with what you’ve got’ Regulate flow of information.

Page 66: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Comparing models Central questions:

Are the stages discrete or cascading? Discrete: must complete before moving on Cascade: can get started as soon as some

information is available Is there feedback?

Top-down only Bottom up too

How many levels are there?

Page 67: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech How does a mental concept get turned into a spoken utterance? Levelt, 1989, 4 stages of production:

1 Conceptualising: we conceptualise what we wish to communicate (“mentalese”).

2 Formulating: we formulate what we want to say into a linguistic plan.– Lexicalisation

– Lemma Selection– Lexeme (or Phonological Form) Selection

– Syntactic Planning3 Articulating: we execute the plan through muscles in the vocal tract.4 Self-monitoring: we monitor our speech to assess whether it is what we

intended to say, and how we intended to say it.

Page 68: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

A model of sentence production Three broad stages:

Conceptualisation deciding on the message (= meaning to

express)

Formulation turning the message into linguistic

representations Grammatical encoding (finding words and

putting them together) Phonological encoding (finding sounds and

putting them together)

Articulation speaking (or writing or signing)

Message

Lexicon

Grammatical

Form

Articulation

FunctionalProcessing

PositionalProcessing

Page 69: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Levelt’s model Four broad stages:

Conceptualisation deciding on the message (= meaning to

express) Formulation

turning the message into linguistic representations

Grammatical encoding (finding words and putting them together)

Phonological encoding (finding sounds and putting them together)

Articulation speaking (or writing or signing)

Monitoring (via the comprehension system)

Message

Lexicon

Grammatical

Form

Articulation

FunctionalProcessing

PositionalProcessing

Page 70: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Network has three strata conceptual stratum

lemma stratum

word-form stratum

Message

Lexicon

Grammatical

Form

Articulation

FunctionalProcessing

PositionalProcessing

Levelt’s model

Page 71: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Tip of tongue state when lemma is retrieved without word-form being retrieved

Message

Lexicon

Grammatical

Form

Articulation

FunctionalProcessing

PositionalProcessing

Levelt’s model

Formulation involves lexical retrieval:

Semantic/syntactic content (lemma)

Phonological content (word-form)

Page 72: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

has stripes is dangerous

TIGER (X)

Fem.

Noun countable

tigre

/tigre/

/t/ /I/ /g/

Lexical concepts

Lemmas

Lexemes

Phonemes

Levelt’s model

Lexicon

Page 73: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conceptual stratum

Conceptual stratum is not decomposed one lexical concept node for

“tiger” instead, conceptual links from

“tiger” to “stripes”, etc.

has stripesis dangerous

TIGER (X)

Page 74: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

First, lemma activation occurs This involves activating a

lemma or lemmas corresponding to the concept

thus, concept TIGER activates lemma “tiger”

Lexical selection

Fem.

Noun countable

tiger

TIGER (X)

Page 75: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

First, lemma activation occurs This involves activating a lemma or

lemmas corresponding to the concept thus, concept TIGER activates lemma

“tiger”

Lexical selection

tiger But also involves activating other lemmas

TIGER also activates LION (etc.) to some extent

and LION activates lemma “lion”

TIGER (X) LION (X)

lion

Page 76: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Selection is different from activation

Only one lemma is selected Probability of selecting the target

lemma (“tiger”) ratio of that lemma’s activation to

the total activation of all lemmas (“tiger”, “lion”, etc.)

Hence competition between semantically related lemmas

Lemma selection

tiger

TIGER (X) LION (X)

lion

Page 77: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Morpho-phonological encoding (and beyond)

The lemma is now converted into a phonological representation

called “word-form” (or “lexeme”)

If “tiger” lemma plus plural (and noun) are activated

Leads to activation of morphemes tigre and s

Other processes too Stress, phonological

segments, phonetics, and finally articulation

/tigre/

/t/ /I/ /g/

Page 78: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Modularity Later processes cannot affect earlier processes

No feedback between the word-form (lexemes) layer and the grammatical (lemmas) layer

Also, only one lemma activates a word form If “tiger” and “lion” lemmas are activated, they

compete to produce a winner at the lemma stratum

Only the “winner” activates a word form The word-forms for the “losers” aren’t accessed

Model’s assumptions

Page 79: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

tiger

Picture-word interference task

Participants name basic objects as quickly as possible

Distractor words are embedded in the object

participants are instructed to ignore these words

Experimental tests

Page 80: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Semantically related words can interfere with naming

e.g., the word TIGER in a picture of a LION

Basic findings

tiger

Page 81: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

However, form-related words can speed up processing

e.g., the word liar in a picture of a LION

Basic findings

liar

Page 82: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Experiments manipulate timing: picture and word can be presented

simultaneously

time

liar

Page 83: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Experiments manipulate timing: picture and word can be presented

simultaneously

liar

time

liar

or one can slightly precede the other We draw inferences about time-course of processing

Page 84: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Schriefers, Meyer, and Levelt (1990)

SOA (Stimulus onset asynchrony)

manipulation -150 ms (word …150 ms … picture) 0 ms (i.e., synchronous presentation) +150 ms (picture …150ms …word)

Auditory presentation of distractors DOT phonologically related CAT semantically related SHIP unrelated word

Page 85: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Schriefers, Meyer, and Levelt (1990)

Auditory presentation of distractors DOT phonologically related CAT semantically related SHIP unrelated word

500520540560580600620640660680700

-150 0 150

DOTCATSHIP

EarlyOnly Semantic effects

Page 86: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Schriefers, Meyer, and Levelt (1990)

Auditory presentation of distractors DOT phonologically related CAT semantically related SHIP unrelated word

500520540560580600620640660680700

-150 0 150

DOTCATSHIP

LateOnly Phonological effects

Page 87: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Early semantic inhibition Late phonological facilitation Fits with the assumption that semantic processing

precedes phonological processing No overlap

suggests two discrete stages in production an interactive account might find semantic and phonological

effects at the same time

Interpretation

Page 88: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Dell’s interactive account Dell (1986) presented the best-known interactive

account other similar accounts exist

Network organization with 3 levels of representation

Semantics (decomposed into features) Words and morphemes phonemes (sounds)

These get selected and inserted into frames

Page 89: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Wor

TACTIC LEXICAL

some Q

summer N

sink V

drown V

some SQ

swim SV

-erAf1

PluralAf2

sink SV

swOn Nu

sO

wOn

INu

mCo

Pluralswim V

S

NP VP

Q(1)

N(2)

Plural(3)

V?

N

Word

SQ SV ?

Stem

Af1 Af2(1)

MORPHOLOG

SYNTAX

SYL

Rime

On ?

Nu Co

PHONOLOGY

1 2

3

C

C1

Dell (1986)

A moment in the production of:

“Some swimmers sink”

Page 90: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Wor

TACTIC LEXICAL

some Q

summer N

sink V

drown V

some SQ

swim SV

-erAf1

PluralAf2

sink SV

swOn Nu

sO

wOn

INu

mCo

Pluralswim V

S

NP VP

Q(1)

N(2)

Plural(3)

V?

N

Word

SQ SV ?

Stem

Af1 Af2(1)

MORPHOLOG

SYNTAX

SYL

Rime

On ?

Nu Co

PHONOLOGY

1 2

3

C

C1

as well as “downwards”

information

information

Interactive because information flows “upwards”

Dell (1986)

Page 91: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

these send activation back to the word level, activating words containing these sounds (e.g., “log”, “dot”) to some extent

Dell (1986)

this activation is upwards (phonology to syntax) and wouldn’t occur in Levelt’s account

FURRY BARKS

dog log

/a//g//d/ /l/

MAMMAL

e.g., the semantic features mammal, barks, four-legs activate the word “dog”

this activates the sounds /d/, /o/, /g/

dot

/t/

Page 92: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Mixed errors Both semantic and phonological relationship to target word Target = “cat”

semantic error = “dog” phonological error = “hat” mixed error = “rat”

Occur more often than predicted by modular models if you can go wrong at either stage, it would only be by chance

that an error would be mixed

Evidence for Dell’s model

Page 93: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

The process of making an error The semantic features of dog activate “cat” Some features (e.g., animate, mammalian) activate “rat” as

well “cat” then activates the sounds /k/, /ae/, /t/ /ae/ and /t/ activate “rat” by feedback This confluence of activation leads to increased tendency for

“rat” to be uttered Also explains the tendency for phonological errors to

be real words Sounds can only feed back to words (non-words not

represented) so only words can feedback to sound level

Dell’s explanation

Page 94: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Why might interaction occur?

Can’t exist just to produce errors! So what is feedback for?

Perhaps because the same network is used in comprehension

So feedback would be the normal comprehension route Alternatively, it simply serves to increase fluency in lemma

selection advantageous to select a lemma whose phonological form is

easy to find

Page 95: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Schriefers, Meyer, and Levelt (1990) DOT phonologically related CAT semantically related SHIP unrelated word

500520540560580600620640660680700

-150 0 150

DOTCATSHIP

EarlyOnly Semantic effects

LateOnly Phonological effects

Evidence against interactivity

Page 96: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Schriefers, Meyer, and Levelt (1990) Also looked for any evidence of a mediated

priming effect

hat dog

DOG (X) CAT (X)

cat

/cat/ /hat/

/t//a//k/ /h/

Found no evidence for it

Evidence against interactivity

Page 97: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Evidence for interactivity

A number of recent experimental findings appear to support interaction under some circumstances (or at least cascading models) Damian & Martin (1999) Cutting & Ferreira (1999) Peterson & Savoy (1998)

Page 98: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Damian and Martin (1999) Picture-Word interference The critical difference:

the addition of a “semantic and phonological” condition

Picture of Apple peach (semantically related) apathy (phonologically related)

apricot (sem & phono related) couch (unrelated) (also no-word control, always

fast)

Evidence for interactivity

peach

Page 99: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results

600

620

640

660

680

700

720

740

-150 0 150SOA

UnrelatedSemanticPhonologicalS & P

Damian & Martin (1999)

early semantic inhibition

Page 100: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results

600

620

640

660

680

700

720

740

-150 0 150SOA

UnrelatedSemanticPhonologicalS & P

Damian & Martin (1999)

late phonological facilitation (0 and + 150 ms)

early semantic inhibition

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Results

600

620

640

660

680

700

720

740

-150 0 150SOA

UnrelatedSemanticPhonologicalS & P

Damian & Martin (1999)

late phonological facilitation (0 and + 150 ms)

Shows overlap, unlike Schriefers et al.

early semantic inhibition

Page 102: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Cutting and Ferreira (1999) Picture-Word interference The critical difference:

Used homophone pictures Related distractors could be to

the depicted meaning or alternative meaning

“game”

“dance”

“hammer” (unrelated)

Only tested -150 SOA

Evidence for interactivity

dance

Page 103: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

ball

BALL (X) BALL (X)

ball

/ball/

Evidence against interactivity

DANCE (X)

dance

GAME (X)

game

Cascading Prediction: dance ball /ball/

Cutting and Ferreira (1999)

Page 104: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results

860870880890900910920930940950960

Unrelated game dance

condition

Early semantic inhibition

Cutting and Ferreira (1999)

Page 105: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Results

860870880890900910920930940950960

Unrelated game dance

condition

Early Facilitation from a phonologically mediated distractor

Early semantic inhibition

Cutting and Ferreira (1999)

Evidence of cascading information flow (both semantic and phonological information at early SOA)

Page 106: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Peterson & Savoy Slightly different task

Prepare to name the picture

If “?” comes up name it

Evidence for interactivity

?

Page 107: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Peterson & Savoy Slightly different task

Prepare to name the picture

If “?” comes up name it If a word comes up

instead, name the word

Evidence for interactivity

liar

Manipulate Word/picture relationship SOA

Page 108: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Peterson & Savoy Used pictures with two

synonymous names

Evidence for interactivity

Used words that were phonologically related to the non dominant name of the picture

sofa couch

Dominantsubordinate

soda

Page 109: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Peterson & Savoy Found evidence for phonological activation of near

synonyms: Participants slower to say distractor soda than unrelated

distractor when naming couch Soda is related to non-selected sofa

Remember that Levelt et al. assume that only one lemma can be selected and hence activate a phonological form

Levelt et al’s explanation: Could be erroneous selection of two lemmas?

Evidence for interactivity

Page 110: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Summary These the findings appears to contradict

the “discrete two-step” account of Levelt et al.

Evidence for interactivity

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Can the two-stage account be saved?

Evidence for interaction is hard to reconcile with the Levelt account However, most attempts are likely to revolve

around the monitor Basically, people sometimes notice a problem and

screen it out Levelt argues that evidence for interaction

really involves “special cases”, not directly related to normal processing

Page 112: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Levelt et al.’s theory of word production: Strictly modular lexical access Syntactic processing precedes phonological

processing Dell’s interactive account:

Interaction between syntactic and phonological processing

Experimental evidence is equivocal, but increasing evidence that more than one lemma may activate associated word-form

Overall summary

Page 113: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Summary

Levelt et al.’s theory of word production: Strictly modular lexical access Syntactic processing precedes phonological

processing Dell’s interactive account:

Interaction between syntactic and phonological processing

Experimental evidence is equivocal, but increasing evidence that more than one lemma may activate associated wordform

Page 114: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Caramazza’s alternative

Caramazza and colleagues argue against the existence of the lemma node

instead they propose a direct link between semantic level and lexeme

syntactic information is associated with the lexeme Also assumes separate lexemes for written and spoken

production This is really a different issue

Page 115: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Much evidence comes from patient data But also evidence from the

independence of syntactic and phonological information in TOT states see discussion of Vigliocco et al. also Caramazza and Miozzo (Cognition,

1997; see also replies by Roelofs et al.)

Page 116: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

From thought to speech How does a mental concept get turned into a spoken utterance? Levelt, 1989, 4 stages of production:

1 Conceptualising: we conceptualise what we wish to communicate (“mentalese”).

2 Formulating: we formulate what we want to say into a linguistic plan.– Lexicalisation

– Lemma Selection– Lexeme (or Phonological Form) Selection

– Syntactic Planning3 Articulating: we execute the plan through muscles in the vocal tract.4 Self-monitoring: we monitor our speech to assess whether it is what we

intended to say, and how we intended to say it.

Page 117: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Models of production As in comprehension, there are serial (modular) and

interactive models Serial models - Garrett, Levelt et al. Interactive models - Stemberger, Dell

Levelt’s monitoring stage (originally proposed by Baars) can explain much of the data that is said to favour interaction between earlier levels

Page 118: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

An model of sentence production Three broad stages:

Conceptualisation deciding on the message (= meaning to

express)

Formulation turning the message into linguistic

representations Grammatical encoding (finding words and

putting them together) Phonological encoding (finding sounds and

putting them together)

Articulation speaking (or writing or signing)

Message

Lexicon

Grammatical

Form

Articulation

FunctionalProcessing

PositionalProcessing

Page 119: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

An model of sentence production Experimental investigations of some of these

issues Time course - cascading vs serial

Picture word interference Separation of syntax and semantics

Subject verb agreement Abstract syntax vs surface form

Syntactic priming

Page 120: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversational interaction“the horse raced past

the barn”

Conversation is more than just two side-by-side monologues.

“the kids swam across the river”

Page 121: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversational interaction“The horse raced past

the barn”

Conversation is a specialized form of social interaction, with rules and organization.

“Really? Why would it do that?”

Page 122: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversation Herb Clark (1996)

Joint action People acting in coordination with one another

doing the tango driving a car with a pedestrian crossing the street

The participants don’t always do similar things

Autonomous actions Things that you do by yourself

Participatory actions Individual acts only done as parts of joint actions

Page 123: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversation Herb Clark (1996)

Speaking and listening Traditionally treated as autonomous actions

Contributing to the tradition of studying language comprehension and production separately

Clark proposed that they should be treated as participatory actions

Page 124: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversation Herb Clark (1996)

Speaking and listening Component actions in production and comprehension come in pairs

Speaking Listening A vocalizes sounds for B

A formalizes utterances for B

A means something for B

B attends to A’s vocalizations

B identifies A’s utterances

B understands A’s meaning

The actions of one participant depend on the actions of the other

Page 125: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversation Herb Clark (1996)

Face-to-face conversation - the basic setting

Features

Co-presence Visibility Audibility Instantanei

ty

Evanescence Recordlessness Simultaneity

Extemporaneity Self-

determination Self-expression

Immediacy Medium Control

Other settings may lack some of these features e.g., telephone conversations take away co-presence and visibility, which may change language use

Page 126: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding ABBOTT: Super Duper computer store. Can I help you? COSTELLO: Thanks. I'm setting up an office in my den, and I'm

thinking about buying a computer. ABBOTT: Mac? COSTELLO: No, the name is Lou. ABBOTT: Your computer? COSTELLO: I don't own a computer. I want to buy one. ABBOTT: Mac? COSTELLO: I told you, my name is Lou. ABBOTT: What about Windows? COSTELLO: Why? Will it get stuffy in here? ABBOTT: Do you want a computer with windows? COSTELLO: I don't know. What will I see when I look in the

windows? ABBOTT: Wallpaper. COSTELLO: Never mind the windows. I need a computer and software. ABBOTT: Software for windows? COSTELLO: No. On the computer! I need something I can use to

write proposals, track expenses and run my business. What have you got?

ABBOTT: Office.

Page 127: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding COSTELLO: Yeah, for my office. Can you recommend anything? ABBOTT: I just did. COSTELLO: You just did what? ABBOTT: Recommend something. COSTELLO: You recommended something? ABBOTT: Yes. COSTELLO: For my office? ABBOTT: Yes. COSTELLO: OK, what did you recommend for my office? ABBOTT: Office. COSTELLO: Yes, for my office! ABBOTT: I recommend office with windows. COSTELLO: I already have an office and it has windows!OK, lets

just say, I'm sitting at my computer and I want to type a proposal. What do I need?

ABBOTT: Word. COSTELLO: What word? ABBOTT: Word in Office. COSTELLO: The only word in office is office. ABBOTT: The Word in Office for Windows.

Page 128: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding COSTELLO: Which word in office for windows? ABBOTT: The Word you get when you click the blue "W.” COSTELLO: I'm going to click your blue "w" if you don't start with

some straight answers. OK, forget that. Can I watch movies on the Internet?

ABBOTT: Yes, you want Real One. COSTELLO: Maybe a real one, maybe a cartoon. What I watch is none of

your business. Just tell me what I need! ABBOTT: Real One. COSTELLO: If it ユ s a long movie I also want to see reel 2, 3 and 4.

Can I watch them? ABBOTT: Of course. COSTELLO: Great, with what? ABBOTT: Real One. COSTELLO; OK, I'm at my computer and I want to watch a movie.What do

I do? ABBOTT: You click the blue "1.” COSTELLO: I click the blue one what? ABBOTT: The blue "1.” COSTELLO: Is that different from the blue "W"? ABBOTT: The blue 1 is Real One and the blue W is Word. COSTELLO: What word?

Page 129: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding ABBOTT: The Word in Office for Windows. COSTELLO: But there are three words in "office for windows"! ABBOTT: No, just one. But it ユ s the most popular Word in the world. COSTELLO: It is? ABBOTT: Yes, but to be fair, there aren't many other Words left. It pretty

much wiped out all the other Words. COSTELLO: And that word is real one? ABBOTT: Real One has nothing to do with Word. Real One isn't even Part of

Office. COSTELLO: Stop! Don't start that again. What about financial bookkeeping you

have anything I can track my money with? ABBOTT: Money. COSTELLO: That's right. What do you have? ABBOTT: Money. COSTELLO: I need money to track my money? ABBOTT: It comes bundled with your computer. COSTELLO: What's bundled to my computer? ABBOTT: Money.

Page 130: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding COSTELLO: Money comes with my computer? ABBOTT: Yes. No extra charge. COSTELLO: I get a bundle of money with my computer? How much? ABBOTT: One copy. COSTELLO: Isn't it illegal to copy money? ABBOTT: Microsoft gave us a license to copy money. COSTELLO: They can give you a license to copy money? ABBOTT: Why not? THEY OWN IT!

(LATER) COSTELLO: How do I turn my computer off?? ABBOTT: Click on "START".

Page 131: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Meaning and understanding Common ground

Knowledge, beliefs and suppositions that the participants believe that they share

Members of cultural communities Shared experiences What has taken place already in the conversation

Common ground is necessary to coordinate speaker’s meaning with listener’s understanding

Page 132: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Conversations are purposive and unplanned Typically you can’t plan exactly what you’re going to say because it depends on another participant

Conversations look planned only in retrospect

Conversations have a fairly stable structure

Structure of a conversation

Page 133: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Joe: (places a phone call) Kevin: Miss Pink’s office -

hello Joe: hello, is Miss Pink in Kevin: well, she’s in, but

she’s engaged at the moment, who is it?

Joe: Oh it’s Professors Worth’s secretary, from Pan-American college

Kevin: m, Joe: Could you give her a

message “for me” Kevin: “certainly” Joe: u’m Professor Worth said

that, if Miss Pink runs into difficulties, .. On Monday afternoon, .. With the standing subcommittee, .. Over the item on Miss Panoff, …

Structure of a conversation Kevin: Miss Panoff? Joe: Yes, that Professor

Worth would be with Mr Miles all afternoon, .. So she only had to go round and collect him if she needed him, …

Kevin: ah, … thank you very much indeed,

Joe: right Kevin: Panoff, right “you”

are Joe: right Kevin: I’ll tell her, Joe: thank you Kevin: bye bye Joe: bye

Page 134: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Structure of a conversation Action sequences: smaller joint projects to fulfill a goal

Adjacency pairs Opening the conversation

Kevin: Miss Pink’s office - hello Joe: hello, ..

Exchanging information about Pink Joe:.., is Miss Pink in Kevin: well, she’s in, but she’s engaged at the moment…

Page 135: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Structure of a conversation Action sequences: smaller joint projects to fulfill a goal

Adjacency pairs Exchanging the message from Worth Joe: u’m Professor Worth said that, if Miss Pink runs into difficulties, .. On Monday afternoon, .. With the standing subcommittee, .. Over the item on Miss Panoff, …

Closing the conversation Kevin: I’ll tell her, Joe: thank you Kevin: bye bye Joe: bye

Page 136: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Opening conversations Need to pick who starts

Turn taking is typically not decided upon in advance

Potentially a lot of ways to open, but we typically restrict our openings to a few ways

Address another Request information Offer information Use a stereotyped expression or topic

Page 137: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Opening conversations Has to resolve:

The entry time Is now the time to converse?

The participants Who is talking to whom?

Their roles What is level of participation in the conversation?

The official business What is the conversation about?

Page 138: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

EavesdropperAll listeners

Identifying participants Conversation often takes place in situations that involve various types of participants and non-participants

Bystander

Side

participantsAll participants

Speaker Addressee

Page 139: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Taking turns Typically conversations don’t involve two (or more) people talking at the same time

Individual styles of turn-taking vary widely

Length of a turn is a fairly stable characteristic within a given individual’s conversational interactions

Standard signals indicate a change in turn: a head nod, a glance, a questioning tone

Page 140: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Taking turns Typically conversations don’t involve two (or more) people talking at the same time Three implicit rules (Sacks et al, 1974)

Rule 1: Current speakers selects next speaker

Rule 2: Self-selection: if rule 1 isn’t used, then next speaker can select themselves

Rule 3: current speaker may continue (or not) These principles are ordered in terms of priority

The first is the most important, and the last is the least important

Just try violating them in an actual conversation (but debrief later!)

Page 141: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Taking turns Typically conversations don’t involve two (or more) people talking at the same time

Use of non-verbal cues Drop of pitch Drawl on final syllable Termination of hand signals Drop in loudness Completion of a grammatical clause Use of stereotyped phrase

“you know”

Page 142: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Negotiating topics Keep the discourse relevant to the topic (remember Grice’s maxims) Coherence again

Earlier we looked at coherence within a speaker, now we consider it across multiple speakers

Must use statements to signal topic shifts

Page 143: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Closing conversations Closing statements

Must exit from the last topic, mutually agree to close the conversation, and coordinate the disengagement

signal the end of conversation (or topic) “okay”

Justifying why conversation should end “I gotta go”

Reference to potential future conversation “later dude”

Page 144: PSY 369: Psycholinguistics Language Production: Experimentally elicited speech errors.

Summary “People use language for doing things with each other, and their use of language is itself a joint action.” Clark (1996, pg387) Conversation is structured

But, that structure depends on more than one individual

Models of language use (production and comprehension) need to be developed within this perspective