Contact phase controls retain negative bipolar correlation in two 1–40 Hz epochs from each of two SEEG patients

We tested phase controls on 1–40 Hz SEEG from two patients in OpenNeuro ds005670. Each control used the same two 10-second epochs. Contact phase controls before a consecutive bipolar montage gave mean correlation of −0.496 and −0.493 for channels with a common contact. Independent bipolar phase controls gave means near zero. An exact covariance formula explains this difference. The observed means were positive. The package preserves code, results, input examples, metadata, and a source retrieval recipe. This is a method test. It does not estimate neural coupling, an artifact fraction, or a population effect.

stereoelectroencephalography · SEEG · bipolar montage · phase randomization · correlation · shared-contact effect · signal processing · connectivity networks