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More than Words: Syntactic Packaging and Implicit Sentiment

Paper · 2009 · Stephan Greene and Philip Resnik

Summary

The paper tackles implicit sentiment, or perspective: attitude carried by text that looks neutral and uses almost the same words as an alternative description. The authors argue that this attitude often lives in syntactic "packaging", such as who appears as the subject or whether a verb is nominalized or passivized. They link these choices to 13 grammatically relevant semantic properties drawn from Dowty's proto-roles and from Hopper and Thompson's semantic transitivity, including volition, causation, change of state and telicity. Two psycholinguistic studies built around verbs of killing show that syntactic form shifts readers' sympathy toward a perpetrator and that the semantic properties predict these sentiment ratings. The authors then introduce OPUS (observable proxies for underlying semantics), automatically computed features that approximate these properties. In a supervised SVM setup, OPUS features beat Lin et al.'s earlier results on the Bitter Lemons corpus. The work matters because it ties lexical-semantic theory to perceived sentiment and gives practical features for detecting bias in non-evaluative text.

Key points

  • The authors combine Dowty (1991) with Hopper and Thompson (1980) to get 13 semantic properties. These are grouped by the subject X, the event, and the object Y of a canonical transitive clause.
  • Property-rating study:
    • 18 native English speakers rated descriptions on a 1–7 scale.
    • The descriptions used 11 killing verbs, split into a "transitive" class (e.g. kill, assassinate) and an "ergative" class (e.g. strangle, drown).
    • Each verb appeared in either a transitive form or a nominalized form.
  • Sentiment study:
    • 31 participants rated how sympathetic headlines were to the perpetrator.
    • Headlines came in transitive, nominalized or passive form.
    • Syntactic form had a significant effect (F(2, 369) = 33.902, p < .001).
    • Transitive headlines drew lower sympathy than the other two forms.
  • Bitter Lemons corpus, Test Scenario 1:
    • The corpus has 297 Israeli and 297 Palestinian documents.
    • Across 423 parameter settings, OPUS averaged 95.41% accuracy, with a best of 97.64%.
    • Lin et al.'s baselines were 88.22% (SVM) and 93.46% (NB-B).
    • OPUS fell slightly below NB-B in only 8 runs.
  • Bitter Lemons corpus, Test Scenario 2 (training on editor documents, testing on guest documents):
    • OPUS averaged 83.12%, with a maximum of 85.86%.
    • It fairly consistently beat Lin's SVM (81.48%) and came close to or matched NB-B (85.85%).

Interesting ideas

  • I1. Test the theory with people first. The authors checked their linguistic hypothesis with controlled human ratings before building features. This gives an engineered feature set a principled justification, which helps any project that needs features beyond word lists.
  • I2. Minimal-pair stimuli. The experiments keep the event and nearly all the vocabulary fixed while changing only the syntax. This cleanly separates structural effects from lexical ones and could be reused to probe models or annotators for framing sensitivity.
  • I3. Pair words with their grammatical role. OPUS-style features tie a specific word to its syntactic role rather than using generic structural templates. This applies to bias or stance detection in any language with a parser, including Ukrainian news text.
  • I4. Split data by source, not by document. The evaluation separates training and test data by author type (editors vs. guests) or by site. This ensures the classifier learns viewpoint rather than author style or topic, a useful safeguard against leakage in stance and perspective tasks.
  • I5. Sweep parameters and report the distribution. The authors report results across hundreds of parameter settings (423 runs) instead of a single best run. This shows how robust the gain over baselines is and makes for a more honest comparison.

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

Cite

Cite as Stephan Greene and Philip Resnik. 2009. More than Words: Syntactic Packaging and Implicit Sentiment. Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics.

The paper itself, not this page. BibTeX from the library's record of the work.

@inproceedings{greene2009more,
  title = {{More than Words: Syntactic Packaging and Implicit Sentiment}},
  author = {Stephan Greene and Philip Resnik},
  booktitle = {Proceedings of Human Language Technologies: The 2009 Annual Conference of the North American Chapter of the Association for Computational Linguistics},
  year = {2009},
  url = {https://aclanthology.org/N09-1057/}
}

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