Lucy (Mingfang) Zhang
@lucyzmf.bsky.social
PhD in brain decoding @ENS
This research was made possible by our great team @jarodlevy.bsky.social, Stéphane d'Ascoli, Jérémy Rapin, F.-Xavier Alario, Pierre Bourdillon, Svetlana Pinet, @jeanremiking.bsky.social at AI at Meta, @bcbl.bsky.social, @cnrs.fr , @psl-univ.bsky.social, and Hôpital Fondation Rothschild!
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February 18, 2025 at 2:45 PM
This research was made possible by our great team @jarodlevy.bsky.social, Stéphane d'Ascoli, Jérémy Rapin, F.-Xavier Alario, Pierre Bourdillon, Svetlana Pinet, @jeanremiking.bsky.social at AI at Meta, @bcbl.bsky.social, @cnrs.fr , @psl-univ.bsky.social, and Hôpital Fondation Rothschild!
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Interested in efficiently decoding these brain signals? Go check out our companion AI paper:
ai.meta.com/research/pub...
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ai.meta.com/research/pub...
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February 18, 2025 at 2:43 PM
Interested in efficiently decoding these brain signals? Go check out our companion AI paper:
ai.meta.com/research/pub...
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ai.meta.com/research/pub...
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Result 4: This dynamic code is observed for all levels of the language hierarchy. Critically, it is level-dependent: context representations “move” more slowly in brain activity than letter representations, allowing a seamless unfolding of language representations.
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February 18, 2025 at 2:43 PM
Result 4: This dynamic code is observed for all levels of the language hierarchy. Critically, it is level-dependent: context representations “move” more slowly in brain activity than letter representations, allowing a seamless unfolding of language representations.
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Result 3:
How does the brain avoid the interference induced by such overlapping representations?
Thanks to a dynamic code! The representations of successive letters continuously move across different neural subspaces.
How does the brain avoid the interference induced by such overlapping representations?
Thanks to a dynamic code! The representations of successive letters continuously move across different neural subspaces.
February 18, 2025 at 2:43 PM
Result 3:
How does the brain avoid the interference induced by such overlapping representations?
Thanks to a dynamic code! The representations of successive letters continuously move across different neural subspaces.
How does the brain avoid the interference induced by such overlapping representations?
Thanks to a dynamic code! The representations of successive letters continuously move across different neural subspaces.
Result 2: Paradoxically, the representations of letters last much longer than their respective corresponding actions, resulting in a representational overlap of successive letters in brain activity.
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February 18, 2025 at 2:42 PM
Result 2: Paradoxically, the representations of letters last much longer than their respective corresponding actions, resulting in a representational overlap of successive letters in brain activity.
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Result 1: We find that, before typing each word, the brain activity is marked by a top-down sequence of representations: context-level representations can be decoded before those of words, syllables, and letters.
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February 18, 2025 at 2:41 PM
Result 1: We find that, before typing each word, the brain activity is marked by a top-down sequence of representations: context-level representations can be decoded before those of words, syllables, and letters.
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Method: We used MEG to record the brain activity of participants while they typed sentences.
Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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February 18, 2025 at 2:41 PM
Method: We used MEG to record the brain activity of participants while they typed sentences.
Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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Result 2: Paradoxically, the representations of letters last much longer than their respective corresponding actions, resulting in a representational overlap of successive letters in brain activity.
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February 18, 2025 at 1:32 PM
Result 2: Paradoxically, the representations of letters last much longer than their respective corresponding actions, resulting in a representational overlap of successive letters in brain activity.
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Result 1: We find that, before typing each word, the brain activity is marked by a top-down sequence of representations: context-level representations can be decoded before those of words, syllables, and letters.
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February 18, 2025 at 1:31 PM
Result 1: We find that, before typing each word, the brain activity is marked by a top-down sequence of representations: context-level representations can be decoded before those of words, syllables, and letters.
3/8
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Method: We used MEG to record the brain activity of participants while they typed sentences.
Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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February 18, 2025 at 1:30 PM
Method: We used MEG to record the brain activity of participants while they typed sentences.
Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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Using linear decoding, we then evaluate whether the brain represents a hierarchy of linguistic features before each word is typed.
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