In one animal micro-SEEG subject, high-impedance contacts showed sub-pitch 300–3000 Hz correlation lengths under common-average reference

In one likely pig (animal) micro-SEEG subject from OpenNeuro ds004819 v1.0.0, we analyzed three 1 Hz spine stimulation runs (0.2, 0.4, 0.6 mA), 44 contacts, and within-column pairs at 120–3840 µm. Correlations were measured in six frequency bands under scalp and common-average references. Pre-specified P1 (shorter 300–3000 Hz than 1–4 Hz length constant in every run × column unit) and P2 (lower 300–3000 Hz nearest-neighbor correlation in every unit) were not supported. P3 (decreasing length constant across bands) was supported with scalp reference but not common-average reference. Under common-average reference, column B had 300–3000 Hz length constants of 63–74 µm, below the 120 µm pitch and therefore only an upper bound, with nearest-neighbor r of 0.37–0.45. Its 1–150 Hz length constants were 127–508 µm. Under scalp reference, shared reference signal dominated column B correlations below 150 Hz. Low-impedance column A remained highly correlated with little distance decline, and its fits were degenerate; this is consistent with a column-specific shared signal such as coupling or common noise, not local neural signals. The subject is not a human patient, its animal species is uncertain, and column A should not be used for spatial-scale estimates without further checks. The package preserves the original plan, code, metadata, hashes, fit table, curves, log, and summaries; raw EDF files are not included.

micro-SEEG · intracranial EEG · inter-contact correlation · electrode impedance · spatial correlation · frequency bands · common-average reference · animal recording