A two-second past average reduced probability error and switches in six readers of one film

In six selected SEEG readers of one film, averaging the current speech probability with three past probabilities reduced mean Brier error from 0.262968 to 0.226122 and output switches from 47.19 to 19.02 per minute. All six readers had lower Brier error. Mean wrong-output time in the first four seconds after a block boundary was 1.708 seconds for both rules, but the person-level interval included gains and losses, so equal boundary performance was not established. A fixed four-second average had lower mean probability error but more mean boundary error time. A later confidence control also lowered probability error without changing labels or switches. The test used six reused recordings and mostly reused test signal from one film; the film schedule alone identifies every label. It does not establish speech-specific neural information, intended-command reading, live BCI performance, or a stimulation benefit.

SEEG · intracranial EEG · probability averaging · Brier error · boundary performance · brain-computer interface