Post-Doctoral Fellow at Children's Hospital of Philadelphia, Radiology Research Department

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Details: CV, ConstantineLignos on Github

I use computational and experimental methods to study the mental mechanisms behind language acquisition, processing, variation, and change. My work combines computational methods with corpus resources and findings from theoretical and experimental linguistics to improve our understanding of language in the mind. I apply this methodology to a diverse set of problems including word segmentation, lexical processing, historical phonology, code-switching, and free variation.

I work primarily with Tim Roberts. As a PhD student in Computer Science at Penn, I was supervised by Mitch Marcus and Charles Yang.

Recent news

At LSA 2014

Friday, January 03

9:00-10:30, Grand Ballroom F
Symposium: The locus of linguistic variation. I'm co-organizing this symposium with Laurel MacKenzie and Meredith Tamminga.
Presenters: Laurel MacKenzie and Meredith Tamminga, Jennifer Nycz, Andries W. Coetzee.

10:30-12:00, Grand Ballroom Foyer, Poster 38
Poster: Examining extragrammatical effects on English auxiliary contraction (with Laurel MacKenzie). (poster)

Sunday, January 03

11:00-11:30, Marquette V
Presentation: Breaking up is easy to do: Evidence for decomposition in regular and irregular forms (with Kyle Gorman). (slides)



Erwin Chan and Constantine Lignos. Investigating the relationship between linguistic representation and computation through an unsupervised model of human morphology learning. Research on Language and Computation, 8 (2), 209-238. Springer Netherlands, 2010. (paper)

Constantine Lignos, Erwin Chan, Mitchell Marcus, and Charles Yang. A rule-based acquisition model adapted for morphological analysis. In C. Peters, G. Di Nunzio, M. Kurimo, T. Mandl, D. Mostefa, A. Penas, and G. Roda, editors, Multilingual Information Access Evaluation I. Text Retrieval Experiments. Lecture Notes in Computer Science, 6241, 658-665. Springer Berlin / Heidelberg, 2010. (preprint)

Conference/workshop proceedings

Daniel J. Brooks, Constantine Lignos, Cameron Finucane, Mikhail S. Medvedev, Ian Perera, Vasumathi Raman, Hadas Kress-Gazit, Mitch Marcus, Holly A Yanco. Make it so: Continuous, flexible natural language interaction with an autonomous robot. Proceedings of the Grounding Language for Physical Systems Workshop at the Twenty-Sixth AAAI Conference on Artificial Intelligence, Toronto, Ontario, Canada, July 23, 2012. AAAI. (paper)

Constantine Lignos and Kyle Gorman. Revisiting frequency and storage in morphological processing. To appear, Proceedings of the 48th Annual Meeting of the Chicago Linguistic Society, April 19-21, 2012. (paper)

Constantine Lignos. Infant word segmentation: An incremental, integrated model. Proceedings of the West Coast Conference on Formal Linguistics 30, April 13-15, 2012. (paper)

Constantine Lignos. You can't get there from here: On interpreting learning experiments. To appear, proceedings of Penn Linguistics Colloquium 36, March 23-25, 2012. (paper)

Constantine Lignos. Modeling infant word segmentation. In Proceedings of the Fifteenth Conference on Computational Natural Language Learning, pages 29-38, Portland, Oregon, USA, June 2011. Association for Computational Linguistics. (paper)

Constantine Lignos. Learning from unseen data. In Mikko Kurimo, Sami Virpioja, and Ville T. Turunen, editors, Proceedings of the Morpho Challenge 2010 Workshop, pages 35-38, Helsinki, Finland, September 2-3 2010. Aalto University School of Science and Technology. Best paper award. (paper)

Constantine Lignos and Charles Yang. Recession segmentation: Simpler online word segmentation using limited resources. In Proceedings of the Fourteenth Conference on Computational Natural Language Learning, pages 88-97, Uppsala, Sweden, July 2010. Association for Computational Linguistics. (paper)

Constantine Lignos, Erwin Chan, Charles Yang, and Mitchell P. Marcus. Evidence for a morphological acquisition model from development data. In Katie Franich, Kate M. Iserman, and Lauren L. Keil, editors, Proceedings of the 34th Annual Boston University Conference on Language Development. Cascadilla Press, 2010. (paper)

Constantine Lignos, Erwin Chan, Mitchell P. Marcus, and Charles Yang. A rule-based unsupervised morphology learning framework. In Working Notes of the 10th Workshop of the Cross-Language Evaluation Forum, CLEF 2009, Corfu, Greece, September 30-October 2 2009. (preprint)

Emily Wang, Constantine Lignos, Ashish Vatsal, and Brian Scassellati. Effects of head movement on perceptions of humanoid robot behavior. In HRI '06: Proceedings of the 1st ACM SIGCHI/SIGART Conference on Human-Robot Interaction, pages 180-185, New York, NY, USA, 2006. ACM. (paper)

Presentations and posters

Is it the size or how you use it? Comparing the effects of subject length and predictability on contraction (with Laurel MacKenzie). Presentation at New Ways of Analyzing Variation 42 (NWAV42), October 19, 2013. (slides)

Toward lexical access mechanisms for regular and irregular forms (with Kyle Gorman). Poster at the 44th Meeting of the North East Linguistic Society (NELS44), October 18, 2013. (poster)

Productivity in analogical change. Presentation at the Manchester and Salford New Researchers Forum in Linguistics, November 2-3, 2012. (slides)

Modeling domain-narrowing phonological change. Presentation at West Coast Conference on Formal Linguistics 31, Feburary 8-10, 2013. (slides)

From lexicon to grammar in infant word segmentation. Presentation at the 87th Annual Meeting of the Linguistic Society of America, January 5, 2013. (slides)

Toward web-scale analysis of codeswitching. (with Mitch Marcus) Poster at the 87th Annual Meeting of the Linguistic Society of America, January 5, 2013. (poster)

Symbolic constraints and statistical methods: Use together for best results. Presentation at Johns Hopkins Human Language Technology Center of Excellence, February 18, 2013. (slides)

Constantine Lignos and Charles Yang. Cuing infants in: From universal to language-specific cues in word segmentation. Presentation at ICIS 2012. June 6-9th, 2012. (slides)

Constantine Lignos and Kyle Gorman. The subtleties of frequency in morphological processing. Poster at CUNY Conference on Human Sentence Processing. March 14-16, 2012.

Laurel MacKenzie and Constantine Lignos. Size matters: The effect of subject length on contraction. Presentation at Georgetown University Round Table on Languages and Linguistics. March 8-11, 2012.

Constantine Lignos. The journey to word segmentation. Presentation at BUCLD 36, November 4-6 (slides)

Constantine Lignos and Charles Yang. Using prosody to bootstrap word segmentation in a more realistic learning environment. Presentation at BCCCD in the symposium "The Role Of Prosody In Guiding Language Learning In Pre-Lexical Infants" organized by Mohinish Shukla, January 14-16 2011. (slides)

Constantine Lignos and Jana Beck. The power of objects in morphology learning. Presentation at LSA Annual Meeting, January 6-9 2011. (slides)