Morteza Dehghani, Reihane Boghrati, Kingson Man, Joseph Hoover, Sarah Gimbel, Ashish Vaswani, Jason Zevin, Mary Immordino, Andrew Gordon, Antonio Damasio, Jonas Kaplan
PsyArXiv Preprint, doi: 10.17605/OSF.IO/QRPP3
Abstract
Drawing from a common lexicon of semantic units, humans fashion narratives whose meaning transcends that of their individual utterances. However, while brain regions that represent lower-level semantic units, such as words and sentences, have been identified, questions remain about the neural representation of narrative comprehension, which involves inferring cumulative meaning. To address these questions, we exposed English, Mandarin and Farsi native speakers to native language translations of the same stories during fMRI scanning. Using a new technique in natural language processing, we calculated the distributed representations of these stories (capturing the meaning of the stories in high-dimensional semantic space), and demonstrate that using these representations we can identify the specific story a participant was reading from the neural data. Notably, this was possible even when the distributed representations were calculated using stories in a different language than the participant was reading. Relying on over 44 billion classifications, our results reveal that identification relied on a collection of brain regions most prominently located in the default mode network. These results demonstrate that neuro-semantic encoding of narratives happens at levels higher than individual semantic units and that this encoding is systematic across both individuals and languages.
Link to article in Human Brain Mapping (behind a pay wall).
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