Two six-pulse groups did not establish excess shared SEEG voltage product at 20 to 300 ms in four people

We tested shared voltage removed by a full common average reference in public SEEG data from four people. Each person had one fixed stimulation site and 12 pulses. The first six and last six pulses formed separate mean maps. The primary windows were 20 to 300 ms after the pulse and -300 to -20 ms before it. The shared product change was divided by the original after-pulse squared map voltage. The equal-person mean was 2.94%. The descriptive 95% bootstrap interval was -0.52% to 8.27%. The exact two-sided person sign-flip value was 0.375. This test did not establish an excess shared product. Average reference removed 52.44% to 98.93% of squared map voltage, but the shared product was negative in two people. An added 60 Hz fit accounted for 69.40% to 98.57% of shared squared voltage. All distinct-pulse products gave a 2.74% mean change on the original scale. We supply a reversible reference audit, exact maps, pulse traces and products, four figures, code, hashes, and repeat instructions. All 2,157 raw files passed hash checks. Raw maps and repeat outputs matched exactly. These four sites do not establish a neural cause or BCI benefit.

stereoelectroencephalography · common average reference · evoked potentials · shared voltage · pulse agreement · reference audit