A predictive coding model of the N400

Samer Nour Eddine*, Trevor Brothers, Lin Wang, Michael Spratling, Gina R. Kuperberg

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)
109 Downloads (Pure)

Abstract

The N400 event-related component has been widely used to investigate the neural mechanisms underlying real-time language comprehension. However, despite decades of research, there is still no unifying theory that can explain both its temporal dynamics and functional properties. In this work, we show that predictive coding – a biologically plausible algorithm for approximating Bayesian inference – offers a promising framework for characterizing the N400. Using an implemented predictive coding computational model, we demonstrate how the N400 can be formalized as the lexico-semantic prediction error produced as the brain infers meaning from the linguistic form of incoming words. We show that the magnitude of lexico-semantic prediction error mirrors the functional sensitivity of the N400 to various lexical variables, priming, contextual effects, as well as their higher-order interactions. We further show that the dynamics of the predictive coding algorithm provides a natural explanation for the temporal dynamics of the N400, and a biologically plausible link to neural activity. Together, these findings directly situate the N400 within the broader context of predictive coding research. More generally, they raise the possibility that the brain may use the same computational mechanism for inference across linguistic and non-linguistic domains.

Original languageEnglish
Article number105755
JournalCognition
Volume246
Early online date29 Feb 2024
DOIs
Publication statusPublished - May 2024

Keywords

  • Bayesian inference
  • Language comprehension
  • Orthographic
  • Prediction
  • Prediction error
  • Semantic

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