Thalamic stereo-EEG detects sleep stages N2 and N3 with discrimination approaching scalp EEG

Thalamic stereo-EEG channels discriminate sleep stages N2+N3 from other stages with AUC 0.94 (RF + HMM) and 0.93 (SleepSEEG) across whole recordings in six adults.

• Why it matters: Scalp EEG is often missing during stereo-EEG monitoring, and implanted devices can’t provide it, limiting sleep staging during epilepsy care. Thalamic rhythms are linked to spindle and slow-oscillation dynamics, motivating thalamic-based staging.
• What they did: The study analyzed 477 h of stereo-EEG with simultaneous scalp EEG in six adults, including 46 thalamic bipolar channels on 11 electrodes. Two classifiers were tested on identical channels: RF + HMM trained leave-one-participant-out and SleepSEEG pretrained without thalamic channels.
• The result: Thalamic channels performed best among regions sampled in all participants (AUC 0.94/0.93 across whole recordings; 0.88/0.86 at night), outperforming mesial temporal and temporal neocortical sites in all six participants. Channel-count-matched and white-matter controls preserved the advantage, and individual thalamic electrodes achieved AUC 0.79–0.99 (10 of 11 at least 0.89), supporting real-time evaluation for sleep-targeted neuromodulation.

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