Early time blocks gave no clear mean error decrease for 50 ms SEEG forecasts in seven people

We tested whether early data could choose when a second depth channel helps a causal voltage forecast. The test used 222 public chronic depth SEEG records from seven people with epilepsy. Three early time blocks chose between target channel history and joint history. Both channels were absent in each simulated 50 ms gap. The later equal person mean normalized error was 0.71113 for target channel history and 0.70856 for early choice. The mean decrease was 0.00257, with a descriptive 95 percent person bootstrap interval of -0.00228 to 0.00945. Error decreased in four people and increased in three. The exact sign flip reference was 0.640625. All planned sensitivity intervals included zero. This test gives no clear mean benefit for this choice rule. It does not establish equal performance or test voltage during stimulation. The package preserves exact raw files, metadata, source hashes, code, coefficients, forecasts, tables, three figures, and reproduction instructions. Fresh source checks, independent numerical checks, and a complete replay passed.

intracranial EEG · voltage forecasting · signal prediction · ridge regression · missing samples · brain-computer interfaces · epilepsy