Article published In: Diachronica
Vol. 38:2 (2021) ► pp.210–258
Phylogenetic signal in phonotactics
Available under the Creative Commons Attribution (CC BY) 4.0 license.
For any use beyond this license, please contact the publisher at rights@benjamins.nl.
Published online: 2 February 2021
https://doi.org/10.1075/dia.20004.mac
https://doi.org/10.1075/dia.20004.mac
Abstract
Phylogenetic methods have broad potential in linguistics beyond tree inference. Here, we show how a phylogenetic approach
opens the possibility of gaining historical insights from entirely new kinds of linguistic data – in this instance, statistical
phonotactics. We extract phonotactic data from 112 Pama-Nyungan vocabularies and apply tests for phylogenetic signal,
quantifying the degree to which the data reflect phylogenetic history. We test three datasets: (1) binary variables recording the presence
or absence of biphones (two-segment sequences) in a lexicon (2) frequencies of transitions between segments, and (3)
frequencies of transitions between natural sound classes. Australian languages have been characterized as having a high degree of
phonotactic homogeneity. Nevertheless, we detect phylogenetic signal in all datasets. Phylogenetic signal is greater in finer-grained
frequency data than in binary data, and greatest in natural-class-based data. These results demonstrate the viability of employing a new
source of readily extractable data in historical and comparative linguistics.
Résumé
Les méthodes phylogénétiques ont le potentiel en linguistique pour faire de l’inférence des arbres. Ici, nous
montrons comment une approche phylogénétique peut être utilisée avec de nouveaux types de données linguistiques – la phonotactique
statistique. Nous quantifions le signal phylogénétique – le degré auquel les données reflètent la phylogénie – dans 112 vocabulaires de la
familie Pama-Nyungan. Nous testons trois types de données : (1) des variables binaires enregistrant la présence ou l’absence de biphones
(séquences de deux segments) (2) les fréquences de les transitions entre segments, et (3) les fréquences de transitions entre les classes
sonores naturelles. Nous détectons un signal phylogénétique dans tous les ensembles de données. Le signal phylogénétique est plus élevé dans
les données de fréquence plus détaillé que dans les données binaires, et le plus grand dans les données qui enregistrent des classes
sonores. Ces résultats montrent que c’est possible d’employer une nouvelle source de données facilement extractibles en linguistique
historique.
Zusammanfassung
Phylogenetische Methoden haben ein breites Potenzial in der Linguistik, das über die Inferenz von Bäumen hinausgeht.
Hier zeigen wir, wie ein phylogenetischer Ansatz mit neuen Arten von Sprachdaten verwendet werden kann – in diesem Fall mit statistischer
Phonotaktik. Wir quantifizieren das phylogenetische Signal – den Grad, in dem die Daten die Phylogenie widerspiegeln – in phonotaktischen
Daten aus 112 Pama-Nyungan-Vokabularen. Wir testen drei Datensätze: (1) binäre Variablen, die das Vorhandensein oder Fehlen von Biphonen
(Zwei-Segment-Sequenzen) aufzeichnen. (2) Häufigkeit von Übergängen zwischen Segmenten und (3) Häufigkeit von Übergängen zwischen
natürlichen Lautklassen. Wir erkennen phylogenetische Signale in allen Datensätzen. Phylogenetische Signal ist in feinkörnigeren
Frequenzdaten größer als in binären Daten und in Daten auf Basis natürlicher Klassen am größten. Diese Ergebnisse zeigen die
Durchführbarkeit davon, eine neue Quelle leicht extrahierbarer Daten in der historischen und vergleichenden Linguistik einzusetzen.
Article outline
- 1.Introduction
- 1.1Motivations
- 1.2Phonotactics as a source of historical signal
- 2.Phylogenetic signal
- 3.Materials
- 3.1Language sample
- 3.2Wordlists
- 3.3Reference phylogeny
- 4.Phylogenetic signal in binary phonotactic data
- 4.1Results for binary phonotactic data
- 4.2Robustness checks
- 5.Phylogenetic signal in continuous phonotactic data
- 5.1Robustness checks
- 5.2Forward transitions versus backward transitions
- 5.3Normalization of character values
- 6.Phylogenetic signal in natural-class-based characters
- 6.1Natural-class-based characters versus biphones
- 7.Discussion
- 7.1Overall robustness
- 7.2Limitations
- 8.Conclusion
- Acknowledgements
- Author contribution statement
- Supplementary materials
- Notes
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