The Message Shapes Phonology - Western Sydneysst2016.westernsydney.edu.au/wp-content/uploads/... ·...
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TheMessageShapesPhonology
SSTsatelliteworkshop,December10-11,2016KathleenCurrieHall,BethHume,T.FlorianJaeger,AndyWedel
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Contextualpredictabilityaffectsrecogni:onandproduc:on
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Phone:cproduc:on[forreview,seeJaeger&Buz,inpress]
• Contextuallymorepredictablewords,syllables,andsegmentstendtoberealizedwith
– higherspeechrate[AyleP&Turk,2004;Belletal.,2008;Gahletal.,2012;Kuperman&Bresnan,2012;Pluymaekersetal.,2005;Post&Jaeger,2010;Seyfarth,2014;Yao,2011]
– lessdispersedvowels[AyleP&Turk,2006]
– lessstronglyar:culatedsegments(centerofgravity)[vanSon&Pols,2003;vanSon&vanSanten,2005]
[3]
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Spokenwordrecogni:on[forreview,seeKuperberg&Jaeger,2016]
• Contextuallymorepredictablewordstendto
– elicitreducedneuralsurprisalresponses[e.g.,N400,Franketal.,2014;Willlemsetal.,2015;seealsoDeLongetal.,2005;vanBerkumetal.,2005;Dikker&Pylkaennen,2013]
– berecognizedfaster[tobespecificit’ssurprisalthatseemstobelinearinprocessing_mes,Frank&Bod,2011;Smith&Levy,2013]
– berecognizedmoreaccuratelyinnoise[Kalikow,Stevens,EllioP,1977]
– berecognizedmoreaccuratelywhenphone_callyreduced[Ernestus&Baayen,2007]
[8]
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Phonologicalvariability[forreview,seeHalletal.,submiPed]
• Contextuallymorepredictablewords,syllables,andsegmentstendtoberealizedwith– higherlikelihoodofphonologicalreduc:on[Belletal.,2003;
Raymondetal.,2006]ordele_on[Gahl&Garnsey,2004]
– lowerlikelihoodofphonologicalinser:on[Tily&Kuperman,2009]
– wheninser_onoccurs,ittendstobeacontextuallypredictablesegment[e.g.,Humeetal.2013;Mafngleyetal.2015,2016]
[9]
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Contextualpredictabilityreflectedinphonologized
paGerns
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Theaverageeffectofcontext[Cohen-Priva,2008,2012;Manin,2006;Piantadosietal.,2011;Seyfarth,2014]
• Ifspokenwordrecogni_onissensi_vetowhatiscontextuallyexpected,contextualexpecta:onsshoulddetermine(overhistorical:me)thephonologicallengthofwords(i.e.theamountofboPom-upsignal)
[11]
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Predictabilityandphonologicallength[Manin,2006;Piantadosietal.,2011]
• Maninuseshumanjudgmentsfromacloze-liketasktoes_mateinforma_on(orunpredictability)
[13]
[Figure1and2fromManin,2006]
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AveragecontextbeGerexplana:onthanfrequency
[14][Figure2fromPiantadosietal.,2011-PNAS]
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Forphonologicalvariability
• (Es'matesof)averagepredictability
– captureeffectsbeyondcontext-by-contextpredictability[Seyfarth,2014]
– evencaptureeffectswherecontext-by-contextpredictabilityseemstomakethewrongpredic:ons[Cohen-Priva,2008,2012]
[15]
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Why?
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[17]
MEANING
Inferringphonologicalunitsfromthephone:csignal
Inferringthemessagefromphonologicalunits
Phonologysubservesthetransferofmeaning(seman:c,pragma:c,social,emo:onal,…)
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Bayesianinference
Σip(Mi|ctxt)p(S|Mi,ctxt)p(M|S,ctxt) p(M|ctxt)
p(S|M,ctxt)=
Posteriorprobabilityofmessagegiventhesignalandthecontext
Probabilityofthesignalgiventhemessageincontext,rela:vizedtoallpossiblemessages
Probabilityofthemessagegiventhecontext
M=messageS=signalctxt=context
*
[Flemming,2010;Hall,Hume,Jaeger&Wedel,submiPed;Kleinschmidt&Jaeger,2015;Nielson&Wilson,2008]
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Bayesianinference
Σip(Mi|ctxt)p(S|Mi,ctxt)p(M|S,ctxt) p(M|ctxt)
p(S|M,ctxt)
Messagepredictability:Howmuchdoesthecontexthelpusknowwhatisgoingtobesaid?
M=messageS=signalctxt=context
SignalSpecificity:Howspecificisthissignalfortheintendedmessage,opposedtoallothers?
*=
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[20]
Whynotalwaysmaximizeintelligibility?
[FigurefromHall,Hume,Jaeger&Wedel,submiPed]
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:me,metabolic,cogni:ve
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Moment-by-momentchangestosignalspecificity…
Ar:culatoryplanning/Choosingaphone:ccode
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Speechonset
pill
bill
CanIhavethe…pill?
Voiceonset_me(VOT)
[23]
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0.00
0.02
0.04
0 50 100 150VOT (ms)
Prob
abilit
y of
VO
TVoicelessVOTsarelonger
b p
hyper-ar:cula:onofvoicelessness
p
[24]
[fromBuz,2016-thesis;basedonVOTdistribu_onsfromBaese-Berk&Goldrick,2009]
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…inresponsetocontextual
requirements(‘in-contextparadigma:cpressure’)
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Contextsw/vs.w/ominimalpaircompe:tor
pillheart raqpill
pillbill raqpill
[26]
[Buz,Tanenhaus,&Jaeger,2016-JML;adaptedfromBaese-Berk&Goldrick,2009-LCP]
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80
120
160
Absen
t
Presen
t
Voiced competitor
VOT
(ms)
Compe:torsleadtohyper-ar:cula:on
*
pillheart raq pillbill raq
Hyper-ar:cula:onincreasesVOTsfrom~85msecsbyabout3-4msecs
[27]
[basedonBuz,Tanenhaus,&Jaeger,2016-JML;seealsoBaese-Berk&Goldrick,2009;Goldricketal.,2013;Kirov&Wilson,2012;Seyfarthetal.,2016]
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Isthisreallyaboutcommunica:on?
Ar:culatoryplanning/Choosingaphone:ccode
Learning-basedpreviouscommunica:vesuccess
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Perceivedcommunica:vesuccess
– Understood
– Misunderstood pill bill raft
pill bill raft
[29]
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Nofeedback
Noerrors Errors
1
21
41
61
81
Tria
l
Partner'sresponse
Not seenTargetCompetitor
Trial typeFillerItem
Perceivedcommunica:vesuccess
[30]
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Nofeedback
Noerrors Errors
80
120
160
Absen
t
Presen
t
Absen
t
Presen
t
Absen
t
Presen
t
Voiced competitor
VOT
(ms)
Hyper-ar:cula:onismodulatedbyperceivedcommunica:vesuccess
* * *
ns*
[basedonBuzetal2016][31]
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0.15
0.20
0.25
0.30
0.15
0.20
0.25
0.30
AbsentPresent
1 3 5Errors seen
Norm
alize
d VO
T (V
OT
/ rim
e)
Error No errors Other errors Voicing errors
Voiced competitor Absent Present
Witheachmiscommunica:on…
[32][Buz,Tanenhaus,&Jaeger,inprep;Buz,2016-thesis]
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Doesthisfacilitatecomprehension?
Ar:culatoryplanning/Choosingaphone:ccode
Communica:vesuccessofar:cula:on
Learning-basedpreviouscommunica:vesuccess
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VOTLi
kelih
ood
Estimate of averagecomprehender's prior knowledge
Absent Present
VOT
Observed voicelessproductions
VOT
P(vo
icel
ess
| VO
T)
Classification functionAbsent Present
Prop
ortio
n co
rrect
Accuracy
Es:ma:ngeffectsoncomprehensionacrossallproduc:on
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Predictedout-of-contextrateofsuccessfulrecogni:on
[35]
Insteadof1erroroutof20wordsà1erroroutof100words!
[basedonBuz&Jaeger,inprep;seealsoSeyfarth,Buz,&Jaeger,2016-JASA-EL]
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Averagingacrosscontexts
Ar:culatoryplanning/Choosingaphone:ccode
Communica:vesuccessofar:cula:on
Learning-basedpreviouscommunica:vesuccess
Changesinphone:crepresenta:onsoflexemes
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0.75
0.80
0.85
0.90
0.95
1.00
Does N
ot
Exist
Exists
Voicing minimal pair
Idea
l obs
erve
rpr
opor
tion
corre
ct
Wedel & Sharp (2014)
0.75
0.80
0.85
0.90
0.95
1.00
Does N
ot
Exist
Exists
Voicing minimal pair
Idea
l obs
erve
rpr
opor
tion
corre
ct
Goldrick et al. (2013)
0.75
0.80
0.85
0.90
0.95
1.00
Absen
t
Presen
t
Voicing minimal pair
Idea
l obs
erve
rpr
opor
tion
corre
ct
Seyfarth et al. (2016)
/p/--/b/contrastConversa:onalspeech
/s/--/z/contrastLabspeech
/p/--/b/contrastLabspeech
[37]
[Buz&Jaeger,inprep;Buz,2016-thesis]
Alsofoundforvowels[samepaper]
Prop
or:o
nofsu
ccessfulre
cogni:on
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Overhistorical:me
Ar:culatoryplanning/Choosingaphone:ccode
Communica:vesuccessofar:cula:on
Learning-basedpreviouscommunica:vesuccess
Changesinphone:crepresenta:onsoflexemes
Changesinphonologicalsystem
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8languages56mergers
524non-mergers
39
18phoneme-pairsystems:Eachcontainsatleastonemerger,andascomparisons,allotherphonemepairsinthesamemajorclass(vowelorconsonant)thatareonephonologicalfeatureapart.
[Wedeletal.,2013a,b]
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Maintenanceofaphonemecontrastpredictedbynumberofminimalpairs.
40
[Wedel,Kaplan&Jackson,2013-Language&Speech]
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[41]
khæʔ
cat
Whatisthemessage?
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Bayesianinferenceoverwhat?
Σip(Mi|ctxt)p(S|Mi,ctxt)p(M|S,ctxt) p(M|ctxt)
p(S|M,ctxt)= *
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Whatwouldwepredictifabiasexistedtowardaccuratetransmission
ofphonemecategories?• Phonemesinweaklocalcontextsshouldbeenhanced
• Thoseinstronglocalcontextsshouldbereduced.• BUTweseetheopposite.
– ‘thestronggetstronger,theweakgetweaker’• ManypaPernsareinsteadconsistentwith:
1. Protec_ngcontrastintheexis_nglexicon2. Incrementalprocessingoflexicalitemsin
comprehension
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Examples:AmericanEnglish/t/
45
/t/
[th] [t] [ɾ] [ʔ]
TheinterlockingpaPernsofallophonicvaria_onexemplifyMPOpredic_onsgivenword-as-message.
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[th]canonicallyappearsintheonsetofstressedsyllables
aPack[əˈthæk]
46
Aspira'onishighlypercep'bleattheonsetofastressedvowel.
Enhancementisassociatedwithposi_onsinwhichcuescontributemoretolexicalcontrast.
khæʔ
cat
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But[th]alsoappearsinwordonset,evenifunstressed.tomato[thəˈmeɪɾoʊ]
47
Cuesnearthebeginningofthewordaremoreinforma've.
Enhancementisassociatedwithposi_onsinwhichcuescontributemoretolexicalcontrast.
khæʔ
catmessage=meaning-bearingunitè
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Wordfinal/t/isoqengloPalized.cat[kæʔ̚]
48
Cuesfarfromthebeginningsofwordsareonaveragelessinforma've,and/t/isespecially
soinEnglish.(seeUrielCohenPriva’stalk)
Reduc_onisassociatedwithcontextsinwhichcuescontributelesstolexicalcontrast.
khæʔ
catmessage=meaning-bearingunitè
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Postvocalic/t/isflappedintheonsettounstressedsyllables,mergingwith/d/.
water[wɑɾɚ]
49
Inthiscontext,the/t~d/contrastdis'nguishesfewminimalpairs
inEnglish.
Reduc_onisassociatedwithcontextsinwhichcuescontributelesstolexicalcontrast.
khæʔ
catmessage=meaning-bearingunitè
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tenbucks tembucks
Nasalplaceassimila:onacrosswords[Turnbull,Seyfarth,Hume,&Jaeger,inprep]
– Moreassimila:onwhenwordwithtargetisinferablefromcontext,p(ten|bucks)
– Lessassimila:onwhenwordwithtargetmakeswordwithtriggerinferable,p(bucks|ten)
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Assimila:onoftargettotrigger
[51]
Inferabilityofwordcontainingtarget
Informa:vityofwordcontainingtargetaboutwordcontainingtrigger
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Conclusions
• PhonologicalpaPernsprovideconvergingevidencethatthemessageismeaning-bearingunits,notsub-lexicalcategories(e.g.phonemes)– PaPernsofcontrastinthelexiconpredictmergerprobabili_es
– Enhancementiscommoninposi_onsmostinforma_veforlexicalprocessing
– Reduc_oniscommoninposi_onsleastinforma_veforlexicalprocessing
– Assimila_onacrossboundariesmorecommonwhentargetismorepredictable
[52]
khæʔ
cat
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Psycholinguis:csarm-in-armwithPhonology
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Ques:onsseekinganswers
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Ques:ons
• Thereisposi_veevidencethatmeaning-bearingunitsshapephonologicalpaPerns.
• Doesthismeanthatthelower-levelcategoriesaren’trelevant,orsimplythatwehaven’tyetfoundtherightroleforthem?[seealsoUrielCohen-Priva’stalk?]– E.g.,Wedeletal.2013,showingthatitmayplayasubsidiaryroleinpredic_ngmergers)
– NB:whatisinforma_vitymeasuredwithregardsto?Condi_onedonwhat?
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Ques:ons
• WehavefocusedhereonlexicalitemsasMBUs.• Whatistheroleofmeaningathigherlevels?Howdoes
communica_ng,e.g.,socialorpragma_cmeaningendupshapingphonologicalsystems?
• Whendolinguis_csystemsshow“horizontal”changes,i.e.,adjustmentstothelexiconand/orchoicesaboutdiscourseorsyntac_cframes,insteadofchangingthephonologicalsignal?[e.g.,Graff,2012,showingunder-representa_onoffeaturally-similarminimalpairsinthelexicon;Graff&Jaeger,2009showingthatstrengthofunder-representa_onofOCP-viola_ngwordsdependingoniden_tyconstraintsinlexicon;Gildea&Jaeger,submiPedshowingwordordersoflanguagesclosetominimizeper-segmentsurprisal]
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Amessage-orientedapproachtophonology[Hall,Hume,Jaeger&Wedel,submiPed]
[57]
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Ques:ons
• Ifenhancementisaboutuniquelyiden_fyingMBUs,thenwhatcountsasa“compe_tor”MBU?
• DostandardmeasuresofneighborhooddensitymaPer?Takingintoaccountcontext?
sub
sup sung
sin
sen sane
suck soon
scene
some
sewn
such
shun
one none
fun bun
ton
run
done
pun
“…under the…” sign
gun sun
[cf.Gahletal.2012;Buz&Jaeger2016;Heller&Goldrick,2014;EricMeinhart’stalk]
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Ques:ons
• IfMBUsarethelocusofpredic_on,thenwhatdoes‘enhancement’actuallymean?
• ’Hyperar_cula_on’isoqenassociatedwithgreaterdura_on/extentofar_culatorygestures
• Butamessage-orientedphonologicalapproachpredictsthatenhancementisaboutuniquelyiden_fyingMBUs,notdispersingphone_corphonologicalcategoriesperse[Wedel2012,Buzetal.,2016-JML]
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[60]
bat
badge
Existenceofaminimalpaircompe:torpredictsVOThyperar:cula:on
[fromWedel,Nelson&Sharp,submiPed]
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Phonologyprovidescorrobora:ngevidence:Centralizingvowelchainshimsexist
NewZealandFrontVowelshiq
æ
ɛ
ɪ
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InteriorvowelscentralizeinEnglishundercompe::on
fromperipheralvowels
center
Interior vowels
ɪ
ɛ
under competition from the periphery
Peripheral vowels i
e
æ
under competition from the interior
−0.10
−0.05
0.00
0.05
0.10
FALSE TRUE
Minimal pair competitor existence
Dis
pers
ion
(sca
led)
Peripheral vowelsInterior vowels
[62][basedonWedeletal.,submiPed]
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Signalreduc:onandredundancy[e.g.,Bresnanetal.,2015;Brown&Dell,1987;Frank&Jaeger,2008;Galloetal.,2008;
Jaeger,2010;Kravtchenko,2015;Kurumada&Jaeger,2015;Levy&Jaeger,2007;Norcliffe&Jaeger,2015;Resnik,1996;Tily&Piantadosi,2009]
[FigurefromJaeger&Buz,inpress-HandbookofPsycholinguis_cs]
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Funding:
UniversityofCanterburytoBHNRSApre-doctoEstebanBuzNSFIIS-1150028CAREER:Communica'veEfficiencyandAdap'venessintheIdealSpeaker(2012-2017)toTFJ
Thank you!