Shared bipolar channels with fixed orientation had higher mean signed beta correlation than disjoint channels in eight short SEEG samples

We tested contact overlap in public SEEG data from eight participants with epilepsy. Each participant contributed three 10 second task windows. In the 13-30 Hz band, mean signed correlation was 0.0070 for shared bipolar pairs and -0.0664 for disjoint pairs. The participant difference was 0.0734, with a bootstrap 95% interval of [0.0264, 0.1239]. The exact two sided sign permutation test gave p = 0.03125. Shared pairs had larger median correlation magnitude. Independent contact phase controls gave shared correlation -0.4985 and disjoint correlation -0.0004. The exact variance model gave -0.4961 for shared pairs. Contact overlap thus produced negative correlation in controls, while the recorded signed result was much higher. The model cannot serve as a correction for recorded connectivity. The recorded class comparison also contains spatial distance effects. The package preserves covariance data, verified range retrieval, source metadata, code, results, and an audit tool. Reader checks passed for all eight participants. The covariance archive rebuilt 240 result records. This is a short methods benchmark from one epilepsy task dataset.

stereoelectroencephalography · bipolar channels · contact overlap · functional connectivity · correlation · signal processing · reproducibility