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A theory-driven model of handshape similarity*

  • Jonathan Keane (a1), Zed Sevcikova Sehyr (a2), Karen Emmorey (a2) and Diane Brentari (a1)


Following the Articulatory Model of Handshape (Keane 2014), which mathematically defines handshapes on the basis of joint angles, we propose two methods for calculating phonetic similarity: a contour difference method, which assesses the amount of change between handshapes within a fingerspelled word, and a positional similarity method, which compares similarity between pairs of letters in the same position across two fingerspelled words. Both methods are validated with psycholinguistic evidence based on similarity ratings by deaf signers. The results indicate that the positional similarity method more reliably predicts native signer intuition judgements about handshape similarity. This new similarity metric fills a gap in the literature (the lack of a theory-driven similarity metric) that has been empty since effectively the beginning of sign-language linguistics.


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This work would not have been possible without the contributions of the Deaf signers who participated in our experiments. The manuscript greatly benefited from the feedback of our colleagues Jordan Fenlon, Leah Geer and Jason Riggle, as well as the anonymous reviewers. All mistakes and omissions are our own. This work was also supported in part by a Doctoral Dissertation Research Improvement Grant (NSF BCS 1251807) and a NSF Research Grant (IIS 1409886).



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Akamatsu, Carol Tane (1982). The acquisition of fingerspelling in pre-school children. PhD dissertation, University of Rochester.
Akamatsu, Carol Tane (1985). Fingerspelling formulae: a word is more or less the sum of its letters. In Stokoe, William C. & Volterra, Virginia (eds.) SLR ’83: sign language research. Silver Spring, MD: Linstock. 126132.
Anderson, David & Burnham, Kenneth (2006). AIC myths and misunderstandings. Available (May 2017) at
Baayen, R. Harald, Piepenbrock, Richard & van Rijn, Hedderik (1995). The CELEX lexical database. [CD-ROM: Release 2.] Philadelphia: Linguistic Data Consortium, University of Pennsylvania.
Bates, Douglas (2010). Linear mixed model implementation in lme4. Ms, Department of Statistics, University of Wisconsin-Madison.
Battison, Robbin (1978). Lexical borrowing in American Sign Language. Silver Spring, MD: Linstok.
Blasdell, Richard & Clymer, William (1978). An empirical study of cipher, phonological and syntactic models of fingerspelling production. American Annals of the Deaf 123. 857872.
Brentari, Diane (1998). A prosodic model of sign language phonology. Cambridge, Mass.: MIT Press.
Brentari, Diane & Padden, Carol A. (2001). Native and foreign vocabulary in American Sign Language: a lexicon with multiple origins. In Brentari, Diane (ed.) Foreign vocabulary in sign languages: a cross-linguistic investigation of word formation. Mahwah, NJ: Erlbaum. 87119.
Burnham, Kenneth P. & Anderson, David R. (2004). Multimodel inference: understanding AIC and BIC in model selection. Sociological Methods and Research 33. 261304.
Cormier, Kearsy, Schembri, Adam & Tyrone, Martha E. (2008). One hand or two? Nativisation of fingerspelling in ASL and BANZSL. Sign Language and Linguistics 11. 344.
Eccarius, Petra (2002). Finding common ground: a comparison of handshape across multiple sign languages. MA thesis, Purdue University.
Gelman, Andrew (2013). P values and statistical practice. Epidemiology 24. 6972.
Gelman, Andrew & Carlin, John (2014). Beyond power calculations: assessing Type S (sign) and Type M (magnitude) errors. Perspectives on Psychological Science 9. 641651.
Gelman, Andrew & Hill, Jennifer (2007). Data analysis using regression and multilevel/hierarchical models. Cambridge: Cambridge University Press.
Gelman, Andrew, Hill, Jennifer & Yajima, Masanao (2012). Why we (usually) don't have to worry about multiple comparisons. Journal of Research on Educational Effectiveness 5. 189211.
Hanson, Vicki L., Liberman, Isabelle Y. & Shankweiler, Donald (1984). Linguistic coding by deaf children in relation to beginning reading success. Journal of Experimental Child Psychology 37. 378393.
Hildebrandt, Ursula & Corina, David (2002). Phonological similarity in American Sign Language. Language and Cognitive Processes 17. 593612.
van der Hulst, Harry (1995). The composition of handshapes. University of Trondheim Working Papers in Linguistics 23. 117.
Johnson, Paul C. D. (2014). Extension of Nakagawa & Schielzeth's R2GLMM to random slopes models. Methods in Ecology and Evolution 5. 944946.
Johnson, Robert E. & Liddell, Scott K. (2010). Toward a phonetic representation of signs: sequentiality and contrast. Sign Language Studies 11. 241274.
Johnson, Robert E. & Liddell, Scott K. (2011a). Toward a phonetic representation of hand configuration: the thumb. Sign Language Studies 12. 316333.
Johnson, Robert E. & Liddell, Scott K. (2011b). Toward a phonetic representation of hand configuration: the fingers. Sign Language Studies 12. 545.
Keane, Jonathan (2014). Towards an articulatory model of handshape: what fingerspelling tells us about the phonetics and phonology of handshape in American Sign Language. PhD thesis, University of Chicago.
Keane, Jonathan & Brentari, Diane (2016). Fingerspelling: beyond handshape sequences. In Marschark, Marc & Spencer, Patricia Elizabeth (eds.) The Oxford handbook of Deaf studies in language: research, policy, and practice. Oxford: Oxford University Press. 146160.
Keane, Jonathan, Brentari, Diane & Riggle, Jason (2013). Dispelling prescriptive rules in ASL fingerspelling: the case of -e-. Poster presented at Theoretical Issues in Sign Language Research 11, London.
Lane, Harlan, Boyes-Braem, Penny & Bellugi, Ursula (1976). Preliminaries to a distinctive feature analysis of handshapes in American Sign Language. Cognitive Psychology 8. 263289.
Liddell, Scott K. & Johnson, Robert E. (1989). American Sign Language: the phonological base. Sign Language Studies 64. 195277.
Liddell, Scott K. & Johnson, Robert E. (2011a). A segmental framework for representing signs phonetically. Sign Language Studies 11. 408463.
Locke, John L. (1970). Short-term memory encoding strategies of the deaf. Psychonomic Science 18. 233234.
Mandel, Mark (1981). Phonotactics and morphology in American Sign Language. PhD dissertation, University of California, Berkeley.
Mauk, Claude E. & Tyrone, Martha E. (2012). Location in ASL: insights from phonetic variation. Sign Language and Linguistics 15. 128146.
Miller, George A. & Nicely, Patricia E. (1955). An analysis of perceptual confusions among some English consonants. JASA 27. 338352.
Nakagawa, Shinichi & Schielzeth, Holger (2013). A general and simple method for obtaining R2 from generalized linear mixed-effects models. Methods in Ecology and Evolution 4. 133142.
Padden, Carol A. (1998). The ASL lexicon. Sign Language and Linguistics 1. 3960.
R Core Team (2016). R: a language and environment for statistical computing. Vienna: R Foundation for Statistical Computing.
Richards, John T. & Hanson, Vicki L. (1985). Visual and production similarity of the handshapes of the American manual alphabet. Perception and Psychophysics 38. 311319.
Sandler, Wendy (1989). Phonological representation of the sign: linearity and non-linearity in American Sign Language. Dordrecht: Foris.
Sandler, Wendy & Lillo-Martin, Diane (2006). Sign language and linguistic universals. Cambridge: Cambridge University Press.
Stokoe, William C., Casterline, Dorothy C. & Croneberg, Carl G. (1965). A dictionary of American Sign Language on linguistic principles. Washington, DC: Gallaudet College Press.
Stungis, James (1981). Identification and discrimination of handshape in American Sign Language. Perception and Psychophysics 29. 261276.
Tyrone, Martha E., Nam, Hosung, Saltzman, Elliot, Mathur, Gaurav & Goldstein, Louis (2010). Prosody and movement in American Sign Language: a task-dynamics approach. Proceedings of Speech Prosody 2010. Available (May 2017) at
Weyer, Stephen A. (1973). Fingerspelling by computer. Stanford: Institute for Mathematical Studies in the Social Sciences, Stanford University.
Whitworth, Cecily (2011). Features, clusters, and configurations: units of contrast in American Sign Language handshapes. PhD dissertation, Gallaudet University.
Wilcox, Sherman (1992). The phonetics of fingerspelling. Amsterdam: Benjamins.
Wilson, Margaret & Emmorey, Karen (1997). Working memory for sign language: a window into the architecture of the working memory system. Journal of Deaf Studies and Deaf Education 2. 121130.

A theory-driven model of handshape similarity*

  • Jonathan Keane (a1), Zed Sevcikova Sehyr (a2), Karen Emmorey (a2) and Diane Brentari (a1)


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