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Post-oralized and devoiced nasals in Panará Myriam Lapierre Symposium on Amazonian Language II April 8, 2017 University of California, Berkeley 1

Presentation V2 Post-oralized and devoiced Nasals in Panarálinguistics.berkeley.edu/~zjohagan/pdflinks/sal2_lapierre_slides.pdf · (Coetzee et al. 2007, Coetzee & Pretorius 2010)!4/12

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Page 1: Presentation V2 Post-oralized and devoiced Nasals in Panarálinguistics.berkeley.edu/~zjohagan/pdflinks/sal2_lapierre_slides.pdf · (Coetzee et al. 2007, Coetzee & Pretorius 2010)!4/12

Post-oralized and devoiced nasals in PanaráMyriam LapierreSymposium on Amazonian Language IIApril 8, 2017University of California, Berkeley

1

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2

Goal1. To present a case of post-nasal devoicing as

evidence of a phonetically unnatural sound change in Panará (Jê)

2. To discuss the implications of this sound change for the internal classification of Jê languages

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Sound changes are phonetically grounded• Understanding mechanisms of speech production and perception can help us

understand recurring sound patterns in unrelated languages (Ohala 1993, Ohala & Ohala 1993)� Most likely arise from language universal factors, i.e. physiological and psychological

factors common to all humans

• A series of phonetically natural sound changes may collectively result in a system that is not phonetically natural (Hayes 1999; Hyman 2001)

• Optimality Theory: Incorporates two main principles� Markedness: militates toward phonetic well-formedness� Faithfulness: militates for contrast preservation� Sound change: reordering of constraints results in (phonetic) well-formedness in

some other aspect of the system

• In summary: Sound changes should be phonetically natural.

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Post-nasal voicing (ND)

• The phenomenon of post-nasal voicing is of particular interest in the debate on whether sound changes should be phonetically natural or not.

• Cross-linguistic surveys claim that the most common process is for the postnasal stop to become voiced (Herbert 1986; Rosenthal 1989, Steriade 1993, and Hyman 2001)

• A number of authors have proposed a universal bias against post-nasal devoicing (*NT) (Pater 1996; Hayes 1999; Hayes & Stivers 2000) .� Articulatorily grounded in aerodynamic principles

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… but sometimes NT• Evidence of post-nasal devoicing in a number of languages

• Mostly from Bantu languages� Tswana (Coetzee et al. 2007, Coetzee & Pretorius 2010)

� 4/12 speakers of Tswana show clear and consistent post-nasal devoicing� an additional 3/12 show infrequent post-nasal devoicing

� Shekgalagari (Solé et al. 2010)� impressionistic description

• Beguš (forthcoming) surveys eight cases of post-nasal devoicing� Argues that no case derives from a single atypical sound change� Rather, from a series of 2-3 natural and well-formed sound changes

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NT in Panará• Post-nasal devoicing is categorical

� Productive for all speakers� Sound change is completely phonologized� If voicing is defined as 50% of the duration is voiced, then no stop in the corpus

can be classified as voiced.� Following Westbury & Keating 1986, Hayes 1999, Coetzee et al 2007

• Contributes to the body of literature providing evidence of unnatural sound changes

• Specifically, this sound change does not seem to result in an improvement of some other aspect of the grammar� Or to arise from a series of phonetically-grounded sound changes

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Typological data on NT

• Out of a sample of 454 languages from UPSID (Maddieson & Ladefoged 1993)� 55 languages (12%) have prenasalized stops� 8 languages have devoiced and prenasalized stops (<2%)

• Why are these segments so rare?

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alveolar closure

vocal folds vibrating

velum closed

lungs 8

alveolar closure

vocal folds closed

velum closed

lungs

Aerodynamics of [d]

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velum open

alveolar closure

vocal folds vibrating

lungs 9

alveolar closure

vocal folds vibrating

velum closed

lungs

Aerodynamics of [nd]velum closed

alveolar closure

vocal folds vibrating

lungs

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Outline• Part 1: Evidence of NT in Panará

� Description of the phenomenon� Data collection, methodology and results

• Part 2: Evidence that NT in Panará is a sound change from ND� 2 proposals for the internal classification of the family� Data from other Jê languages

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• Jê language, ~600 speakers

• Spoken in central Brazil

Panará

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PhonemesBilabial Alveolar Palatal Velar

Stop p t ts k

Nasal m n ɲ ŋ

Fricative s

Approximant w ɾ j

Short oral (9) Short nasal (6)

i ɯ u i ɯ ũ

e ɤ o ẽ ã õ

ɛ a ɔ

Long oral (9) Long nasal (5)

i: ɯ: u: i: ũ:

e: ɤ: o: ẽ: ã: õ:

ɛ: a: ɔ:

Consonants (12)

Vowels (29)

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The phonological process

� In Panará, nasal consonants are only fully nasalized before nasal vowels

/m,  n,  ɲ,  ŋ/  à  [m,  n,  ɲ,  ŋ]  /  __  Ṽ  

� NCs appear as allophones of nasal stops� Process of post-oralization and devoicing of nasal consonants (Lapierre et al., 2016)

/m,  n,  ɲ,  ŋ/  à  [mp,  nt,  ns,  ŋk]  /  __  V

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Data collection• Acoustic data was collected from 12 native speakers of Panará

� only analyzed two so far

• 50 target words� mono- or disyllabic� target syllable types included:

� NṼ, NCV, CV, CṼ

• Target words were presented inside a carrier phrase� “Ĩkje hẽ ka tõ syrĩ [X]”, (I say the word [X].)

• Words and carrier phrases presented on a laptop screen alongside a picture depicting the target word� 5 semi-randomized blocks

• Total of 250 target words produced per speaker

• Calculated percentage of voicing duration for phones in target syllables 14

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Results

• One-way ANOVA (DV: voicing duration, IV: phone type)� F = 9055, p<.001

• Tukey HSD post-hoc analysis� All pairwise comparisons are significantly different (p<.001), � except (V, N), (C, NC-C)

• Panará exhibits a clear case of categorical post-nasal devoicing

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V N C NC-N NC-C

voicing duration 95% 98% 7% 91% 4%

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Internal classification of Jê• At the moment, controversial

� Especially with respect to the position of Panará within the structure

• Two recent proposals� Nikulin 2015� Lapierre et al. 2016

• I’m making a phonological argument here for the proposition by Lapierre et al. 2016� See Bardagil-Mas (forthcoming) for additional evidence on ergative case-

marking in favour this tree

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Internal classification of Jê

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Tree A (Lapierre et al. 2016)

Tree B (Nikulin 2015)

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Internal classification of Jê

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Tree A (Lapierre et al. 2016)

Tree B (Nikulin 2015)

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Data from other Jê languages

• Realization of /m/ / V__V in Jê languages

• Which form should be reconstructed for Proto-Jê?� [mb] seem to be the most suitable option� It occurs most frequently

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PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

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• Realization of /m/ / V__V in Jê languages

• Kaingang: /m/ à [bmb] / V __ V à [mb] / Ṽ __ V

• If a language has [bmb], then it also has [mb] (Stanton, 2015)� [mb] >> [bmb]

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PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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• Realization of /m/ / V__V in Jê languages

• Kaingang: /m/ à [bmb] / V __ V à [mb] / Ṽ __ V

• If a language has [bmb], then it also has [mb] (Stanton, 2015)� [mb] >> [bmb]

21

PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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• Realization of /m/ / V__V in Jê languages

• It is uncontroversial that Tapayuna is most closely related to Kĩsêdjê

• In the 1960s, the Tapayuna were massacred by rubber barons. (Camargo 2010)� Only 31 speakers survived. � They were incorporated into Mebêngôkre & Kĩsêdjê speaking villages.� Language is critically endangered. 22

PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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• Realization of /m/ / V__V in Jê languages

• Tapayuna [m] is due to recent heavy contact with Mebêngôkre.� Not an independent innovation.� Nearly all speakers are bilingual in Mebêngôkre.

� Many young speakers are L1 MBG and L2 TPY

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PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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• Realization of /m/ / V__V in Jê languages

• Panará and Timbira� oral release is devoiced

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PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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• Realization of /m/ / V__V in Jê languages

• Which form should be reconstructed for Proto-Jê?� [mb]� post-oralization occurs in 7/10 languages� oralization occurs in 9/10 languages

25

PNR TMB MBG APN KNS TPY XAV XER KNG XKL

[mp] [mp] [m] [mb] [mb] [mb] ~ [m] [b] [b] [bmb] [mb]

Data from other Jê languages

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Internal classification of Jê

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Tree A (Lapierre et al. 2016)

[mb]

[mb]

[mp]

[mb]

[mp]

[mp]

[mb]

[mb ~ m][m]

[mb]

[b]

[b]

[bmb]

[mb]

[b]

[m]

[bmb][mb]

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Internal classification of Jê

27

Tree A (Lapierre et al. 2016)

[mb]

[mb]

[mp]

[mb]

[mp]

[mp]

[mb]

[mb ~ m][m]

[mb]

[b]

[b]

[bmb]

[mb]

[b]

[m]

[bmb]

4 innovations

[mb]

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Internal classification of Jê

28

Tree B (Nikulin 2015)

[mb][bmb]

[mb]

[b]

[mp]

[m]

[mb]

[mb]

[mb ~ m]

[mp]

[b][b]

[bmb]

[mb]

[mb]

[mp]

[mp]

[m]

[mb]

[mb]

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Internal classification of Jê

29

Tree B (Nikulin 2015)

[mb][bmb]

[mb]

[b]

[mp]

[m]

[mb]

[mb]

[mb ~ m]

[mp]

[b][b]

[bmb]

[mb]

[mb]

[mp]

[mp]

[m]

[mb]

5 innovations2 x [mb] à [mp]

[mb]

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Internal classification of Jê

30

Tree B (Nikulin 2015)

[mb][bmb]

[mb]

[b]

[mp]

[m]

[mb]

[mb]

[mb ~ m]

[mp]

[b][b]

[bmb]

[mb]

[mp] [m][mb]

[mb][mp]

[mb]

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Internal classification of Jê

31

Tree B (Nikulin 2015)

[mb][bmb]

[mb]

[b]

[mp]

[m]

[mb]

[mb]

[mb ~ m]

[mp]

[b][b]

[bmb]

[mb]

[mp] [m][mb]

[mb]

6 innovations2 x [mb] à [mp] à [mb]

[mp]

[mb]

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Interim summary• I’ve shown evidence in favour of tree A over Tree B

� Tree A requires only 4 innovations (1x mb > mp)� Tree B is less parsimonious

� 5 innovations: 2x mb > mp� 6 innovations: 2x mp > mp > mb (back-mutation)

• Even if the internal classification of Tree A is incorrect, ND à NT still occurred (at least!) once.

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Conclusion

• The change of ND à NT in Panará seems to be an instance of a phonological change for the worse� No synchronic evidence of an improvement in some other area of the

grammar resulting from this diachronic change� Unlike other documented cases of post-nasal devoicing

• Although we should avoid positing unnatural sound changes when possible, changes for the worse do occur in natural language� as evidenced by Panará ND à NT� no clear evidence that this occurred as a series of phonetically natural

sound changes

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References• Alves. F. de C. (2007). Sistema Fonológico do Timbira Apãniekrá (Fonemas, Sílaba e Acento). Proceedings of the Macro-Jê meeting. Brasilia, Brazil.

• Bardagil-Mas, B. (forthcoming). Case and Agreement in Panará. Doctoral Dissertation, University of Groningen, The Netherlands.

• Begus, G. (forthcoming). Post-Nasal Devoicing and a Probabilistic Model of Phonological Typology, ms.

• Camargo, N. da S. (2010). Língua Tapayúna: Aspectos Sociolinguísticos e uma Análise Fonológica Preliminar. Master's thesis, Universidade Estadual de Campinas, Brazil.

• Coetzee, A. W., Lin, S., & Pretorius, R. (2007). Post-nasal devoicing in Tswana. In J. Trouvain, & B. William (Eds.), ICPhS XVI: Proceedings of the 16th international congress of phonetic sciences (pp. 861–864). Saarbrücken.

• Coetzee, A. W. & Pretorius, R. (2010). Phonetically grounded phonology and sound change: The case of Tswana labial plosives. Journal of Phonetics (38): 404–421.

• Gakran, N. (2005). Aspectos Morfossintáticos da Língua Laklãnõ (Xokleng) “Jê”. Master’s thesis, Universidade Estadual de Campinas, Brazil.

• Hayes, B. (1999). Phonetically Driven Phonology: The Role of Optimality Theory and Inductive Grounding. In M. Darnell, E. Moravscik, M. Noonan, F. J. Newmeyer, & K. Wheatly (Eds.), Functionalism and formalism in linguistics, Vol. I: General papers (pp. 243–285). Amsterdam: JohnBenjamins.

• Herbert, R (1986). Language Universals, Markedness Theory, and Natural Phonetic Processes. Berlin: Walter de Gruyter & Co.

• Hyman, L. M. (2001). On the limits of phonetic determinism in phonology: *NC revisited. In E. Hume, & K. Johnson (Eds.), The role of speech perception phenomena in phonology (pp. 141–185). NewYork: Academic Press.

• Lapierre, M., Bardagil-Mas, B., Salanova, A. P. (2016). The Nasal Consonants of Panará. Talk presented at the the 21st Workshop on the Structure and Constituency in Languages of the Americas (WSCLA 2016), Université du Québec à Montréal, Canada

• Lapierre, M., Bardagil-Mas, B., Salanova, A. P. (2016). A Reconstruction of Proto-Northern Jê Phonemics. Talk presented at Amazônicas VI, Universidad Nacional de Colombia, Leticia, Colombia

• Maddieson, I. & Ladefoged, P. (1993). Phonetics of Partially Nasal Consonants. In M. K. Huffman, & R. A. Krakow, Nasals, nasalization, and the velum (Vol. 5 of Phonetics and phonology, pp. 251-301). London: Academic Press.

• De Mattos, R. (1973) Fonêmica Xerente. Série Lingüística 1. SIL: Brasília.

• Nikulin, A. (2015). On the genetic unity of Jê-Tupí-Karib. Diploma thesis, Lomonosov Moscow State University, Russia.

• Nonato, R. (2014). Clause Chaining, Switch Reference and Coordination. Doctoral dissertation, MIT, Cambridge.

• De Oliveira, C. C. (2005). The Language of the Apinajé People of Central Brazil. Doctoral dissertation, University of Oregon, Eugene.

• Pater, Joe (1996) *NC. Proceedings of the North East Linguistic Society 26, Graduate Linguistic Student Association, University of Massachusetts, Amherst, pp. 227-239.

• Rosenthall, S. (1989). The phonologyofnasal-obstruentsequences. MA thesis, Linguistics, McGill University, Montréal.

• Salanova, A. P. (2001). A nasalidade em Mebengokre e Apinayé: o limite do vozeamento soante. Master's thesis, Universidade Estadual de Campinas, Brazil.

• Solé, M.-J.; Hyman, L, M.; & Monaka, K. C. (2010). More on Post-Nasal Devoicing: The Case of Shekgalagari. Journal of Phonetics 38 (4): 299–319.

• Quintino, W. P. (2000). Aspectos da Fonología Xavante. Master’s thesis, Universidade Estadual de Campinas, Brazil.

• Westbury, J. R., & Keating, P. A. (1986). On the naturalness of stop consonant voicing. Journal of Linguistics, 22, 145–166.

• Wiesemann, U. (1972). Die phonologische und grammatische Struktur der Kaingáng-Sprache. The Hague: Mouton. 34