![]() Here, we investigate whether band ratio measures truly reflect oscillatory power differences, and/or to what extent ratios may instead reflect other periodic changes, such as in center frequency or bandwidth, and/or aperiodic activity. However, electrophysiological signals contain periodic components and a 1/f-like aperiodic component, the latter of which contributes power across all frequencies. ![]() This assumes that the measure reflects relative powers of distinct periodic components that are well captured by predefined frequency ranges. ![]() Band ratio measures are typically interpreted as reflecting quantitative measures of periodic, or oscillatory, activity. Band ratio measures, computed as the ratio of power between two frequency bands, are a common analysis measure in neuroelectrophysiological recordings.
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