portrait

Post-Doctoral Fellow at The Children's Hospital of Philadelphia (CHOP), Radiology Research Department

Email: c...@lignos.org

Details: CV, ConstantineLignos on Github, @ConstantineLig, ResearchGate

My research explores the computational structure of language from a fundamentally interdisciplinary perspective. I apply computational methods to a projects in many domains, including traditional natural language processing, human language acquisition and processing, and language variation and change. I create simple, interpretable computational models by taking advantage of findings from theoretical linguistics, psycholinguistics, and langugage acquisition.

I am currently a post-doc working with Tim Roberts at CHOP. As a PhD student in Computer Science at Penn, I was supervised by Mitch Marcus and Charles Yang. Frequent collaborators include Jonathan Brennan, Vasu Raman, and Laurel MacKenzie.


Latest news

Editing a special issue in Linguistic Variation

Meredith Tamminga, Laurel MacKenzie and I are co-editing a special issue on the "Locus of Linguistic Variation" for Linguistic Variation. We've extended the deadline to January 5th 2015, and look forward to more submissions.

Publication in Autonomous Robots

My work on the SUBTLE MURI with Vasu Raman, Cameron Finucane, Mitch Marcus, and Hadas Kress-Gazit is now in press:
Provably correct reactive control from natural language.

At Society for the Neurobiology of Language 2014

Oscillatory dynamics to time-stretched speech during lexical decision (abstract)
Jonathan Brennan, Constantine Lignos, Max Cantor, David Embick, and Timothy P.L. Roberts
Poster C11, Thursday, August 28, 3:45-5:45 pm, Grote Zaal


Papers

Provably correct reactive control from natural language  (manuscript)
Constantine Lignos, Vasumathi Raman, Cameron Finucane, Mitchell Marcus, Hadas Kress-Gazit
Autonomous Robots, in press.

Spectro-temporal correlates of lexical access during auditory lexical decision
Jonathan Brennan, Constantine Lignos, David Embick, and Timothy P.L. Roberts
Brain and Language, 133, 39-46. 2014

Sorry Dave, I'm afraid I can't do that: Explaining unachievable robot tasks using natural language
Vasumathi Raman, Constantine Lignos, Cameron Finucane, Kenton CT Lee, Mitchell P. Marcus, and Hadas Kress-Gazit
Proceedings of Robotics: Science and Systems IX, 2013

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

Revisiting frequency and storage in morphological processing
Constantine Lignos and Kyle Gorman
Proceedings of the 48th Annual Meeting of the Chicago Linguistic Society, 2012

Infant word segmentation: An incremental, integrated model
Constantine Lignos
Proceedings of the West Coast Conference on Formal Linguistics 30, 2012

You can't get there from here: On interpreting learning experiments
Constantine Lignos
Proceedings of Penn Linguistics Colloquium 36, 2012

Modeling infant word segmentation
Constantine Lignos
Proceedings of the Fifteenth Conference on Computational Natural Language Learning, 29-38. 2011

Learning from unseen data
Constantine Lignos
Proceedings of the Morpho Challenge 2010 Workshop, 35-38. 2010.

Recession segmentation: Simpler online word segmentation using limited resources
Constantine Lignos and Charles Yang
Proceedings of the Fourteenth Conference on Computational Natural Language Learning, 88-97. 2010

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

Evidence for a morphological acquisition model from development data
Constantine Lignos, Erwin Chan, Charles Yang, and Mitchell P. Marcus
Proceedings of the 34th Annual Boston University Conference on Language Development, 2, 269-280. 2010

A rule-based acquisition model adapted for morphological analysis
Constantine Lignos, Erwin Chan, Mitchell P. Marcus, and Charles Yang
Multilingual Information Access Evaluation I. Text Retrieval Experiments. Lecture Notes in Computer Science, 6241, 658-665. 2010

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

Effects of head movement on perceptions of humanoid robot behavior
Emily Wang, Constantine Lignos, Ashish Vatsal, and Brian Scassellati
HRI '06: Proceedings of the 1st ACM SIGCHI/SIGART Conference on Human-Robot Interaction, 180-185, 2006

Presentations and posters

Oscillatory dynamics to time-stretched speech during lexical decision
Jonathan Brennan, Constantine Lignos, Max Cantor, David Embick, and Timothy P.L. Roberts
Poster at the Sixth Annual Meeting of the Society for the Neurobiology of Language, August 28, 2014

Breaking up is easy to do: Evidence for decomposition in regular and irregular forms
Constantine Lignos and Kyle Gorman
Presentation at the 88th Annual Meeting of the Linguistic Society of America, January 3rd, 2014

Examining extragrammatical effects on English auxiliary contraction
Constantine Lignos and Laurel MacKenzie
Poster at the 88th Annual Meeting of the Linguistic Society of America, January 2nd, 2014

Is it the size or how you use it? Comparing the effects of subject length and predictability on contraction
Constantine Lignos and Laurel MacKenzie
Presentation at New Ways of Analyzing Variation 42, October 19, 2013

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

Productivity in analogical change
Constantine Lignos
Presentation at the Manchester and Salford New Researchers Forum in Linguistics, November 2-3, 2012

Modeling domain-narrowing phonological change
Constantine Lignos
Presentation at West Coast Conference on Formal Linguistics 31, Feburary 8-10, 2013

From lexicon to grammar in infant word segmentation
Constantine Lignos
Presentation at the 87th Annual Meeting of the Linguistic Society of America, January 5, 2013

Toward web-scale analysis of codeswitching
Constantine Lignos and Mitchell P. Marcus
Poster at the 87th Annual Meeting of the Linguistic Society of America, January 5, 2013

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

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

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

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

The journey to word segmentation
Constantine Lignos
Presentation at BUCLD 36, November 4-6, 2011

Using prosody to bootstrap word segmentation in a more realistic learning environment
Constantine Lignos and Charles Yang
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

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