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 studies of endangered languages. As more communities attempt to revive their heritage languages or seek the help of linguists in the development of writing systems, phonetic detail becomes more important. The techniques that are now available for doing phonetic research in field locations are much better than those available even a decade ago, and they continue to improve. The full range of phonetic diversity in human languages should become clearer in the coming years as many more intriguing patterns are discovered. Acknowledgments This research was funded by National Science Foundation grants NSF-1128159 and NSF-0966411 to Haskins Laboratories. Reethee Antony, Colleen Leung and Aude Noiray provided crucial support in the collection and analysis of the Tahltan data, as did Bryan Gick and Donald Derrick. Acknowledgments are given to the community of San Martín Itunyoso.AT References Avelino, H. (2001). “Phonetic correlates of fortis-lenis in Yalálag Zapotec, ” unpublished Master’s thesis, University of California, Los Angeles. Childers, D. G., and Krishnamurthy, A. K. (1985). “A critical review of electroglottography,” CRC Critical Reviews in Biomedical Eng. 12, 131–161. Childers, D. G., and Lee, C. K. (1991). “Vocal quality factors: Analysis, synthesis, and perception,” J. Acoust. Soc. Am. 90,  2394–2410. DiCanio, C. T. (2010). “Itunyoso Trique (Illustrations of the IPA),” J. Intl. Phonetic Assn. 40, 227–238. DiCanio, C. T. (2012). “The phonetics of fortis and lenis consonants in Itunyoso Trique,” Intl. J. Am. Linguistics 78, 239–272. Gafos, A. (1996). “The articulary basis of locality in phonology,” unpublished Ph.D. dissertation, Johns Hopkins University, Baltimore, MD. Gick, B., Bird, S., and Wilson, I. (2005). “Techniques for field appli- cation of lingual ultrasound imaging,” Clinical Linguistics and Phonetics 19, 503–514. Heinrich, N., D’Alessandro, C., Doval, B., and Castellengo, M. (2004). “On the use of the derivative of electroglottographic sig- nals for characterization of nonpathological phonation,” J. Acoust. Soc. Am. 115, 1321–1332. Helgason, P. (2002). “Preaspiration in the Nordic Languages: Synchronic and diachronic aspects,” unpublished Ph.D. thesis, Stockholm University. IGABE (News Agency) (2011, March 9). “Resisten niños triquis a usar lengua materna,” Noticias Voz e Imagen. Iskarous, K., Nam, H., and Whalen, D. H. (2010). Perception of articulatory dynamics from acoustic signatures. J. Acoust. Soc. Am., 127, 3717-3728. Jansen, W. (2004). “Laryngeal contrast and phonetic voicing: A lab- oratory phonology approach to English, Hungarian, and Dutch,” unpublished Ph.D. dissertation, Groningen University. Jelinek, F. (2009). “The dawn of statistical ASR and MT,” Computational Linguistics 35, 483–494. Juang, B. H., and Furui, S. (2000). “Automatic recognition and understanding of spoken language: A first step toward natural  Phonetics of Endangered Languages 41 

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