Mean delta-to-alpha change contrast was 0.069 dB 10 to 30 seconds after marked seizure end in 31 selected SEEG patients

We tested whether the delta-to-alpha power ratio rose more at seizure onset pairs than at unmarked pairs in the same contact name groups. We used 62 public recordings from 31 selected SEEG patients in OpenNeuro ds004100, version 1.1.3. We compared 10 to 30 seconds after marked seizure end with 60 to 40 seconds before marked seizure start. The mean marked minus unmarked change was 0.069 dB. The 95 percent patient bootstrap interval was -1.316 to 1.430 dB. The exact two-sided sign-flip p value was 0.923492. This test assumes independent patients and null sign symmetry. The ratio rose by 7.432 dB at marked pairs and 7.363 dB at unmarked pairs. At marked pairs, mean delta power fell by 3.339 dB and alpha power fell by 10.771 dB. A ratio increase therefore did not require an increase in absolute delta power. The primary result does not prove equal changes between the classes. The cohort and periods came from an earlier gamma study. This is an informed analysis of the same signals. The package contains new float64 features, code, raw check samples, source versions and hashes, figures, and repeat instructions.

intracranial EEG · seizure onset zone · delta power · alpha power · delta-to-alpha ratio · postictal activity