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Title: Tracking change in word meaning. A dynamic visualization of diachronic distributional semantics
Authors: Heylen, Kris
Wielfaert, Thomas
Speelman, Dirk
Issue Date: 13-Mar-2013
Conference: "Workshop on the Visualization of Linguistic Patterns" in conjunction with the 35th Annual Conference of the German Linguistic Society (DGfS) location:Potsdam, Germany date:12-15 March 2013
Abstract: Within Computational Linguistics, distributional models of semantics have become the mainstay of
large-scale modeling of lexical semantics (see Turney and Pantel 2010 for an overview).
Distributional modeling also hold a large potential for research in Linguistics proper: It allow linguists
to base their analysis on large amounts of usage data, thus vastly extending their empirical basis,
AND they make it possible to detect potentially interesting semantic patterns. However, so far, there
have been relatively few applications, mainly because of the technical complexity and the lack of a
linguist-friendly interface to explore the output. To address this issue, Heylen et al. (2012) proposed
an interactive visualization of a distributional similarity matrix based on Multi-Dimensional Scaling for
synchronic data. In this paper, we extend this approach to diachronic data and propose a dynamic
visualization of distributional semantic change through motion charts. As a case study, we look at the
meaning changes that 17 positive evaluative adjectives have undergone in the Corpus of Historical
American English (COHA, Davies 2012) between 1860 and 2000.

Visualization of diachronic distributional data has been proposed previously by a.o. Rohrdantz et al.
(2011) but these representations were static. In this paper, we use a dynamic visualization of
linguistic change, first proposed by Hilpert (2011) for manually coded data sets, and extend here to
the large-scale, unsupervised distributional models. For a set of adjectives that express positive
evaluation (a.o. brilliant, magnificent, fantastic, terrific, superb). We investigate how they carve up
this semantic space and how this changes over time. From COHA, we extracted a word-by-context
co-occurrence vector using a window of 4 left and right for each adjective in each of the 14 decades
between 1860 and 2000. Next, we calculated the cosine similarity between all adjective/decade
vectors and used non-parametric MDS to represent these similarities in 2 dimensions. The MDS
solution with adjective and decade information was then visualized with the R-package googleVis, an
interface between R and the Google Visualization API. The resulting, dynamic motion chart is
available online under https://perswww.kuleuven.be/~u0038536/magnificent/Magnificent3D.html.
The chart shows adjectives as clickable bubbles with a time slider to move between decades.
'Playing' the chart shows dynamically how the semantic distances between the adjectives changes
over time. In the center, adjectives like splendid, magnificent or great represent the core of the
concept and they remain relatively stable over time. However, figure 1 shows that terrific was in
1860 still quite far removed from the center, probably because it was still predominantly used in its
literal sense of FRIGHTENING. Only around 1950, terrific starts to move to the core and acquires its
positive evaluative meaning. Since, distributional models are a completely automatic technique with
a multitude of possible parameter settings, this particular solution is probably not yet optimal. An
important next step is therefore the evaluation of the automatically induced patterns against a
manually coded and interpreted dataset.

References
Davies, M. 2010: online. The Corpus of Historical American English (COHA): 400+ million words,
1810-2009. Available at: http://corpus.byu.edu/coha (accessed August 2012).

Heylen, K., Speelman, D., & Geeraerts, D. (2012). Looking at word meaning. An interactive
visualization of Semantic Vector Spaces for Dutch synsets. Proceedings of the EACL-2012 joint
workshop of LINGVIS & UNCLH: Visualization of Language Patters and Uncovering Language
History from Multilingual Resources, 16-24.

Hilpert, M. (2011). Dynamic visualizations of language change: Motion charts on the basis of bivariate
and multivariate data from diachronic corpora. International Journal of Corpus Linguistics 16(4),
435-461.

Rohrdantz, C., Hautli, A., Mayer, T., Butt, M., Keim, D. A., & Plank, F. (2011). Towards Tracking
Semantic Change by Visual Analytics. Proceedings of the 49th Annual Meeting of the Association
for Computational Linguistics: Human Language Technologies, 305-310

Turney, P. D., & Pantel, P. (2010). From Frequency to Meaning: Vector Space Models of Semantics.
Journal of Artificial Intelligence Research, 37(1), 141-188.
Figure 1: Movement of terrific and great through distributional space from 1860 to 2000
Publication status: published
KU Leuven publication type: IMa
Appears in Collections:Quantitative Lexicology and Variational Linguistics (QLVL), Leuven
Quantitative Lexicology and Variational Linguistics (QLVL), Campus Sint-Andries Antwerp
Linguistics Research Unit - miscellaneous

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