How are clinical concepts represented and steerable in EEG foundation models?

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• Clinical concepts in EEG foundation models fall into three operational regimes: selectively steerable, encoded but entangled, and non-encoded.claim0.865
  Interpretive claim summarizing the spectrum of concept steerability discovered.
• What clinical concepts are encoded in the internal representations of EEG foundation models?question0.849
  Primary research question driving the extraction and benchmarking of SAE features
• EEG foundation models achieve state-of-the-art clinical performance yet their internal computations remain opaque, constituting a barrier to clinical trust.claim0.825
  Motivating claim for the entire paper
• Can concept steering interventions on EEG foundation models be made selective rather than globally destructive?question0.821
  Research question motivating the introduction of the probe area metric and identification of operational regimes
• What physiologically interpretable frequency signatures correspond to latent concept steering manipulations in EEG foundation models?question0.811
  Research question motivating the spectral decoder methodology
• Concept steering experiments identify three distinct operational regimes across clinical concepts in EEG foundation models.finding0.808
  Main empirical finding of the concept steering analysis
• EEG foundation modelsconcept0.804
  Large transformer models pretrained on EEG data for clinical tasks; the object of interpretability in this paper.
• We hypothesize that applying SAE-based mechanistic interpretability to EEG foundation models can expose representational failures and thereby improve clinical trust.hypothesis0.782
  Overarching motivating hypothesis of the paper