Ryskina, M., et al. (2025, August 15).
arXiv.org.
Abstract
Cognitive science and neuroscience have long faced the challenge of disentangling representations of language from representations of conceptual meaning. As the same problem arises in today's language models (LMs), we investigate the relationship between LM--brain alignment and two neural metrics: (1) the level of brain activation during processing of sentences, targeting linguistic processing, and (2) a novel measure of meaning consistency across input modalities, which quantifies how consistently a brain region responds to the same concept across paradigms (sentence, word cloud, image) using an fMRI dataset (Pereira et al., 2018). Our experiments show that both language-only and language-vision models predict the signal better in more meaning-consistent areas of the brain, even when these areas are not strongly sensitive to language processing, suggesting that LMs might internally represent cross-modal conceptual meaning.
Here are some thoughts:
The researchers identified brain regions that respond to a concept's meaning regardless of whether it's shown as text, related words, or a picture, and found that AI language models best predict activity in exactly those meaning-focused regions, even in a vision-related area with no link to language, hinting that these models grasp meaning beyond just words. Notably, bigger models and instruction-tuned ones were no better, which runs against some earlier expectations. The honest takeaway: it's a suggestive hint rather than proof, since it rests on correlations and a single dataset of 17 people, but it points to language models picking up a kind of meaning closer to how the brain handles ideas.








