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MT syntactic priming effects on L2 English speakers

Paper · 2020 · Natália Resende, Benjamin Cowan and Andy Way

Summary

The paper asks whether reading machine translation output changes how second-language speakers later build their own English sentences. Nineteen Brazilian Portuguese speakers (20 were recruited) with intermediate or advanced English took part in a pretest-priming experiment adapted from psycholinguistics. The target was English possessive noun phrases. These have two forms: a prepositional version that mirrors Portuguese word order ("the handles of the cutlery") and a prenominal compound that does not ("the cutlery handles"). In the pretest, participants produced English descriptions of pictures without any MT exposure. In the priming phase, they first translated with Google Translate and then described pictures aloud. After seeing Google Translate output, participants used the compound form much more often and the prepositional form much less. Proficiency also mattered: stronger speakers showed a larger shift. The authors read this as evidence that MT output can prime L2 syntax and may help learners reach structures that clash with their native word order. They present it as the first test of syntactic alignment between an MT system and its human users.

Key points

  • Participants: 20 Brazilian Portuguese speakers living in Dublin were recruited and one was excluded, leaving 19 (14 women, mean age 33.7). Proficiency was measured with the 25-question online Cambridge General English test (mean score 13.8).
  • Materials: 104 images were used across the pretest and priming phases. Stimuli ran in PsychoPy, and spoken answers were recorded with a voice recorder.
  • Response shares (Table 1):
    • Pretest: PNP 38.42%, NP 33.42%, other 28.16%.
    • After Google Translate: PNP 10.50%, NP 55%, other 34%.
    • This is a rise of 21.58 points for the non-prepositional NP.
  • Model: a mixed-effects logit model predicting the produced structure from the English proficiency score, the test phase, and their interaction, with random intercepts and test-phase slopes by participant and random intercepts by item.
    • Test phase was significant (p < .001).
    • Proficiency score was significant (p < .001).
    • The Test × proficiency interaction was significant (p < .05), with more proficient speakers showing a larger shift toward NP.
  • Planned future work: more participants, other structures such as datives with and without prepositions, the role of system popularity, and whether the imitation is conscious.

Interesting ideas

  • I1. The study pits two English variants of the same meaning against each other, where one copies the speaker's native order and the other does not, so any shift toward the unfamiliar variant clearly reflects outside influence rather than L1 transfer.
  • I2. Each subject is measured on a baseline before exposure and again after it, so every person serves as their own control.
  • I3. Random intercepts for items and random slopes for subjects keep a few unusual people or pictures from driving the overall result.
  • I4. Answers that fit neither target structure are kept as a separate "other" category instead of being discarded, which shows how often the task fails to produce either form.
  • I5. The syntax people just read biases the structures they produce next, and the effect is stronger for less familiar forms.

For Mova

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

  • I1 (frames): Treat "office table" and "table of the office" as one possession frame, and add paired test sentences like these to check that the frame builder ignores the surface form.
  • I2 (learn): Run the same held-out items before and after adding a repair rule or teacher tier, alongside an untouched control set, so that real gains can be told apart from drift.
  • I3 (learn): Score parser or reader changes with per-sentence and per-genre random effects instead of one pooled accuracy, so that a handful of easy sentences cannot inflate a gain.
  • I4 (answer): Report "neither right nor wrong form" outputs as their own bucket in test scoring, so that abstentions and off-target answers stay visible.
  • I5 (back): Let the generator optionally mirror the structures in the user's input, or deliberately vary them, and make that choice visible in the explanation trace.

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 Natália Resende, Benjamin Cowan and Andy Way. 2020. MT syntactic priming effects on L2 English speakers. Proceedings of the 22nd Annual Conference of the European Association for Machine Translation.

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

@inproceedings{resende2020mt,
  title = {{MT syntactic priming effects on L2 English speakers}},
  author = {Natália Resende, Benjamin Cowan and Andy Way},
  booktitle = {Proceedings of the 22nd Annual Conference of the European Association for Machine Translation},
  year = {2020},
  url = {https://aclanthology.org/2020.eamt-1.26/}
}

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