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Study design
Researchers recorded hippocampal neuron responses while people listened to narrative speech. They used encoding models to test whether neural activity reflected word meaning after accounting for phonemic and grammatical information, then compared distances between neural response patterns with semantic similarity.
What the findings show
Meaning was represented across distributed population activity rather than by a simple one-word, one-neuron code. Neural response patterns for words with related meanings were more similar, and contextualized language-model embeddings aligned with the population responses. The findings support a role for the human hippocampus in representing meaning during listening.
Limits
The recordings were made in a clinical setting and do not represent a population-wide survey of healthy people. Comparisons with language models describe similarity between representations; they do not show that the brain uses the same computations or that the hippocampus alone understands language.
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Sources
- A population code for semantics in human hippocampus — Nature Neuroscience ·
Research news is not medical advice or a recommendation to use a substance. Read findings in the context of the study design, participants and limitations. Editorial standards.
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