DOI: 10.32322/jhsm.2011990 ISSN: 2636-8579

Quantitative EEG correlates of visual background slowing in routine EEG

Nur Türkmen, Duygu Engez Hancı, Güray Koç
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Aims: Background slowing on routine electroencephalography (EEG) is a clinically relevant nonepileptiform finding. This study aimed to determine how visually identified pathological background slowing is represented by interpretable quantitative EEG (qEEG) parameters.Methods: This retrospective study included 56 adults who underwent routine EEG between 2023 and 2026. Recordings were classified by two epileptologists blinded to the qEEG results as normal background activity (n=30) or pathological background slowing (n=26). Quantitative analysis included relative delta, theta, alpha, and beta power from 19 scalp channels, together with the delta/alpha ratio (DAR), the (delta+theta)/(alpha+beta) ratio (DTABR), dominant frequency, and generalized slowing percentage.Results: Compared with the normal group, the pathological slowing group showed higher relative delta and theta power and lower relative alpha and beta power (all p

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