What is the RECOMMENDED LFF/HFF for the EOG and EEG channels?

What is the RECOMMENDED LFF/HFF for the EOG and EEG channels?

• A. LFF 0.3 / HFF 35
• B. LFF 0.5 / HFF 25
• C. LFF 1 / HFF 15
• D. LFF 1 / HFF 35

Answer: (A)

When configuring the filters for EEG and EOG signals, you want to balance preserving sleep-relevant waveforms with removing drift and noise. A low-frequency cutoff of 0.3 Hz keeps the slow components of the EEG and eye movements intact, including delta activity and other slow patterns essential for accurate sleep staging, while reducing baseline drift. A high-frequency cutoff of 35 Hz attenuates muscle artifact and high-frequency noise without sacrificing the majority of the EEG bands used to identify sleep stages. Using higher low-frequency cutoffs or lower high-frequency cutoffs would either blunt slow waves that are important for scoring or strip away faster but still informative activity, which can hinder accurate interpretation. Therefore, the recommended LFF/HFF for EEG and EOG channels is 0.3 Hz / 35 Hz.

When configuring the filters for EEG and EOG signals, you want to balance preserving sleep-relevant waveforms with removing drift and noise. A low-frequency cutoff of 0.3 Hz keeps the slow components of the EEG and eye movements intact, including delta activity and other slow patterns essential for accurate sleep staging, while reducing baseline drift. A high-frequency cutoff of 35 Hz attenuates muscle artifact and high-frequency noise without sacrificing the majority of the EEG bands used to identify sleep stages. Using higher low-frequency cutoffs or lower high-frequency cutoffs would either blunt slow waves that are important for scoring or strip away faster but still informative activity, which can hinder accurate interpretation. Therefore, the recommended LFF/HFF for EEG and EOG channels is 0.3 Hz / 35 Hz.