Anesthetized Brains Process Language and Predict Words — SkimNews
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- Baylor College of Medicine researchers found the hippocampus of fully anesthetized patients processes language, distinguishes word categories including nouns, verbs, and adjectives, and predicts upcoming words, per findings published in the journal Nature.
- Dr. Sameer Sheth and colleagues used Neuropixels probes to record hundreds of individual hippocampal neurons in patients undergoing epilepsy surgery under general anesthesia.
- Hippocampal neurons responded differently to unexpected tones amid a series of repeating sounds and grew better at distinguishing odd tones over time — evidence of neural plasticity occurring without conscious awareness.
- Neural signals in the hippocampus also carried information that predicted upcoming words in spoken sentences, a predictive-coding capacity previously documented only in awake, attentive listeners.
- Dr. Benjamin Hayden noted that predictive coding "is something we associate with being awake and attentive, yet it's happening here in an unconscious state."
- First author Dr. Vigi Katlowitz raised the possibility of deploying the recorded signals in speech prosthetics for patients who lost speech from stroke or brain injury.
- The study carries stated limitations: findings apply to one type of general anesthesia, and it remains unclear whether comparable language processing occurs during sleep or coma.
Why it matters: Baylor's team recorded hundreds of individual hippocampal neurons in fully anesthetized patients and found the brain still categorizes words and anticipates upcoming language — reframing theories of what consciousness contributes to cognition, with researchers flagging potential applications for speech prosthetics in stroke or injury patients.
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