“…Second, aperiodic activity varies systematically and semi-independently of oscillations. The aperiodic exponent has been found to vary as a function of age (Finley et al, 2022;Hill et al, 2022;Voytek et al, 2015), clinical status (Karalunas et al, 2022;Shuffrey et al, 2022), cognitive function (Cross et al, 2022;Immink et al, 2021;Ostlund et al, 2021;Ouyang et al, 2020), and sleep state (Schneider et al, 2022). Third, these systematic differences in aperiodic activity could act as a substantial confound and create the appearance of systematic differences in oscillations in total power and ratio-based measures (Donoghue, Dominguez, et al, 2020;Donoghue, Haller, et al, 2020;Finley et al, 2022).…”