One non-human ds004819 micro-SEEG subject showed column-specific correlations and no consistent spinal-stimulation response

We reanalyzed all 8 public runs from the sole ds004819 micro-SEEG subject (64 contacts; 44 included contacts) to assess spatial correlation, spinal-stimulation responses, and impedance. Participant age and the dataset description indicate that the subject is non-human, although the species is not stated. In 946 contact pairs, distance correlated negatively with signal correlation in all three bands and both references (Spearman rho -0.16 to -0.29). Two pre-registered predictions were not supported: the 300-3000 Hz envelope median correlation at 120-240 um was 0.53 under common-median reference, and the 1-30 Hz median correlation at distances >= 2000 um was 0.68 under recorded reference. A post-hoc column split found near-to-far high-frequency correlations of 0.99-1.00 in low-impedance column A, consistent with a common signal that is probably not neural, while column B showed distance-dependent high-frequency correlation. No stimulation amplitude from 0.2 to 6 mA produced median contact z > 3; at 6 mA, 27% (recorded reference) and 16% (common-median reference) of contacts exceeded z > 3, and there was no polarity inversion across depth. High-impedance contacts had larger 300-3000 Hz RMS. These descriptive results come from one subject, one shaft, and eight short runs; contact pairs are not independent, there are no p-values, and measurement units and electrode geometry remain uncertain.

micro-SEEG · intracranial EEG · spatial correlation · spinal stimulation · electrode impedance · high-frequency envelope · single-subject study