Probe · depth of anesthesia

Inside the Anesthetized Mind.

The monitor in every operating room measures whether the brain is talking to itself. We measure whether it is still listening to the room.

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01 · The metrics

One number, computed from the rhythm.

SDP is a spectral depth proxy — log alpha over delta, anchored to this patient's own awake baseline. It is what today's monitors compute.

SDP

0

Alpha index

0

Reconstructed trace — illustrative

02 · The comparison

Same drug. Opposite patients.

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07

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18

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03 · The sandbox

Push the index and watch it lie.

Aim a simulated beam at the thalamus and drive delta. The index falls — not because anything happened to consciousness, but because delta sits in its denominator.

SimulationNo such device exists and no intervention was recorded.
The workspace

There is no number for connected consciousness. We are proposing there should be.

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Real · SDP mathREAL EEG: Sedation recordingsPROJECTION: Cortical Scalp Field

Replaying real EEG (EEGLAB sedation recordings) with real SDP math, in the Chennu et al. 2016 file contract (n=20, propofol sedation). SDP is a spectral proxy, not BIS. The cortical surface is a scalp projection, not source localization.