Exploring BERT’s Sensitivity to Lexical Cues using Tests from Semantic Priming

Kanishka Misra, Allyson Ettinger, Julia Rayz


Abstract
Models trained to estimate word probabilities in context have become ubiquitous in natural language processing. How do these models use lexical cues in context to inform their word probabilities? To answer this question, we present a case study analyzing the pre-trained BERT model with tests informed by semantic priming. Using English lexical stimuli that show priming in humans, we find that BERT too shows “priming”, predicting a word with greater probability when the context includes a related word versus an unrelated one. This effect decreases as the amount of information provided by the context increases. Follow-up analysis shows BERT to be increasingly distracted by related prime words as context becomes more informative, assigning lower probabilities to related words. Our findings highlight the importance of considering contextual constraint effects when studying word prediction in these models, and highlight possible parallels with human processing.
Anthology ID:
2020.findings-emnlp.415
Volume:
Findings of the Association for Computational Linguistics: EMNLP 2020
Month:
November
Year:
2020
Address:
Online
Editors:
Trevor Cohn, Yulan He, Yang Liu
Venue:
Findings
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
4625–4635
Language:
URL:
https://aclanthology.org/2020.findings-emnlp.415
DOI:
10.18653/v1/2020.findings-emnlp.415
Bibkey:
Cite (ACL):
Kanishka Misra, Allyson Ettinger, and Julia Rayz. 2020. Exploring BERT’s Sensitivity to Lexical Cues using Tests from Semantic Priming. In Findings of the Association for Computational Linguistics: EMNLP 2020, pages 4625–4635, Online. Association for Computational Linguistics.
Cite (Informal):
Exploring BERT’s Sensitivity to Lexical Cues using Tests from Semantic Priming (Misra et al., Findings 2020)
Copy Citation:
PDF:
https://aclanthology.org/2020.findings-emnlp.415.pdf
Code
 kanishkamisra/emnlp-bert-priming