Fig. 1

Comparison of absolute power spectrum values between the AESD and PFS groups, overall and by brain region. The vertical axes represent the mean APS values, and the horizontal axes represent each frequency band. The graphs illustrate the mean APS values across all electrodes (overall) and in the frontal (average of the Fp1–F3 and Fp2–F4 electrodes), centrotemporal (average of C3 the T3 and C4–T4 electrodes), and parieto-occipital (average of P3 the O1 and P4–O2 electrodes) regions of the brain in all patients. The mean APS values in the theta, alpha, beta, and gamma frequency bands were significantly lower in the frontal regions of the patients with AESD than in those with PFS. AESD, acute encephalopathy with biphasic seizures and late reduced diffusion; APS, absolute power spectrum; PFS, prolonged febrile seizure.