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Expectation and Locality Effects in the Prediction of Disfluent Fillers and Repairs in English Speech

Paper · 2019 · Samvit Dammalapati, Rajakrishnan Rajkumar and Sumeet Agarwal

Summary

The paper tests whether the places where speakers become disfluent can be accounted for by three psycholinguistic theories: Surprisal Theory, Dependency Locality Theory (DLT), and the hypothesis known as Uniform Information Density (UID). It uses the Switchboard corpus (via the Switchboard NXT release) and sorts words into three classes: reparandum, disfluent filler, and fluent word. A one-vs-all logistic regression is trained on features of the fluent words just before and just after each disfluency. Those features are trigram lexical surprisal, two UID variance measures, DLT integration and storage costs, and word duration. Each feature set is compared against a baseline that knows only speaker properties.

UID adds almost nothing. Surprisal helps modestly. Duration and DLT costs help a lot. The pattern suggests that disfluencies come right before hard material, and that speakers ease their load beforehand, partly by slowing down. Reparandums do not behave like fillers. The authors suggest this is because the reparandum words themselves may carry the easy, low-cost content. The work matters because it shows comprehension-difficulty metrics can say something about speech production.

Key points

  • Data and sampling: after filtering, the data held 14,923 reparandum cases, 12,183 filler cases and 558,361 fluent words. Each class was randomly downsampled to 12,183 for balance.
  • Baseline: the classifier uses only gender, age and speech rate, and reaches 37.18% accuracy. Every gain is tested against it with McNemar's test.
  • Lexical surprisal: computed from a trigram model trained on the Open American National Corpus with SRILM.
    • Adding surprisal on both sides gives 40.02%.
    • The following word alone adds about 1.6 points.
    • Words after disfluencies tend to have high surprisal.
  • UID and duration:
    • The best UID gain is only 0.42 points.
    • Duration of the preceding word gives a jump of 9.64 points, to 46.82%.
    • Surprisal and duration correlate at 0.49.
  • DLT costs: dependencies were obtained by stripping disfluencies from the constituency parses and converting them with the Stanford converter. DLT features gave the top accuracy of 48.57%, but integration cost effects pointed in unexpected directions.

Interesting ideas

  • I1. Instead of looking at the disfluent token itself, the authors take features from the fluent neighbours on each side, so fillers and repairs can be compared on equal terms.
  • I2. Integration cost (summed length of the dependencies closed at a word) and storage cost (count of still-open dependencies) are cheap per-word difficulty scores that fall straight out of a dependency tree.
  • I3. Each theory is judged by its accuracy gain over a baseline built only from nuisance variables, with McNemar's test for significance and regression weights to check the direction of the effect.
  • I4. Disfluencies are removed from constituency trees before converting them to dependency graphs, so the syntax is computed over the fluent skeleton.

For Mova

How these ideas could serve Mova, our small open language model — its files, stages and tests:

  • I1 (tokens): when cleaning conversational input, Mova could flag likely filler or repair spots from cues on the surrounding words, rather than relying only on a fixed list of filler forms.
  • I2 (tree): these scores could be logged for every parsed word as an explainable "hard spot" signal, used to pick which sentences to route to stronger parsers or reviewers.
  • I3 (learn): new features or repair rules could be accepted only if they beat a nuisance-only control both significantly and in the predicted direction, which gives a clean negative control.
  • I4 (tree): a treebank built from speech transcripts could apply the same strip-then-convert step, keeping repair spans as side annotations instead of forcing them into the UD tree.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

 Fields, topics and concepts

Cite

Cite as Samvit Dammalapati, Rajakrishnan Rajkumar and Sumeet Agarwal. 2019. Expectation and Locality Effects in the Prediction of Disfluent Fillers and Repairs in English Speech. Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Student Research Workshop.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.18653/v1/n19-3015

@inproceedings{dammalapati2019expectation,
  title = {{Expectation and Locality Effects in the Prediction of Disfluent Fillers and Repairs in English Speech}},
  author = {Samvit Dammalapati, Rajakrishnan Rajkumar and Sumeet Agarwal},
  booktitle = {Proceedings of the 2019 Conference of the North American Chapter of the Association for Computational Linguistics: Student Research Workshop},
  year = {2019},
  doi = {10.18653/v1/n19-3015},
  url = {https://doi.org/10.18653/v1/n19-3015}
}

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