Testing the Predictions of Surprisal Theory in 11 Languages
Summary
Evidence for surprisal theory, the idea that words harder to predict from prior context take longer to read, comes mostly from English readers. This paper tests whether the theory holds across typologically diverse languages. The authors use the MECO dataset, which provides eye-tracking records for comparable texts in many languages, and analyze eleven of them spanning five families. Word-level surprisal and contextual entropy (expected surprisal) come from autoregressive language models: the multilingual mGPT, plus monolingual models trained on large corpora and on a size-matched small corpus of about 30 million words per language. Linear regression models of reading times are compared by how much a target predictor raises held-out log-likelihood over a baseline (delta log-likelihood). Surprisal improves prediction in every language, and contextual entropy adds further power in most of them. Linear models fit as well as more flexible ones, which supports a linear link. As the broadest cross-linguistic test so far, the study strengthens the tie between information theory and incremental reading.
Key points
- The study tests three hypotheses: surprisal predicts reading times, contextual entropy predicts reading times, and the surprisal–reading time relation is linear. All three are supported cross-linguistically.
- The eleven languages are Korean, Turkish, Hebrew and Finnish, along with seven others: Spanish, Russian, Italian, Greek, German, English and Dutch. Estonian from MECO was excluded because mGPT was not trained on it.
- The multilingual mGPT and the monolingual models showed no clear difference in predicting reading times. Even the smallest monolingual models were trained on about 30M tokens, so truly low-resource settings remain untested.
- The authors contrast their approach with concurrent MECO work by de Varda and Marelli (2022). That study used the masked model mBERT, which sees context on both sides, so its pseudo-surprisal estimates are not psychologically plausible.
- The authors list several limitations. Indo-European languages dominate the sample, and each other family has only one language. All languages are high-resource, and the readers come from industrialized societies.
Cited by
- Aggregated Transformer Attention Measures Predict Reading Times Beyond Surprisal
- Word predictability estimates from language models are not robust to tokenizer vocabulary
- Semantic Information: A Difference That Makes a Difference
- Reading Time in the Wild: An Assessment of Readability Predictors Based on Naturally-Observed Reading Times
- Predicting States of Understanding in Explanatory Interactions Using Cognitive Load-Related Linguistic Cues
- Toward Cognitive Alignment in Large Language Models: Integrating Linguistic Theory and Human Data
Cite
@article{wilcox2023testing,
title = {{Testing the Predictions of Surprisal Theory in 11 Languages}},
author = {Wilcox, Ethan G. and Pimentel, Tiago and Meister, Clara and Cotterell, Ryan and Levy, Roger P.},
journal = {Transactions of the Association for Computational Linguistics},
year = {2023},
doi = {10.1162/tacl\_a\_00612},
url = {https://doi.org/10.1162/tacl_a_00612}
}References
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