Which LFF and HFF combination is RECOMMENDED for routine monitoring of EOG signals?

Which LFF and HFF combination is RECOMMENDED for routine monitoring of EOG signals?

• A. LFF 0.3 Hz, HFF 35 Hz
• B. LFF 10 Hz, HFF 100 Hz
• C. LFF 0.3 Hz, HFF 70 Hz
• D. LFF 0.1 Hz, HFF 15 Hz

Answer: (A)

For routine EOG monitoring, you want to remove slow baseline drift while keeping the eye movement signal intact and still suppressing high-frequency noise. A low-frequency filter set at 0.3 Hz accomplishes this by attenuating very slow drift (like electrode drift or perspiration) without discarding the slower eye movements themselves. Pairing it with a high-frequency limit of 35 Hz provides a gentle low-pass effect that reduces high-frequency noise and muscle artifacts while preserving the main energy of eye movements, which mostly reside below a few tens of Hz. This combination yields a clean, interpretable EOG trace that reliably shows REMs and saccades. Using a higher low-cut like 10 Hz would start to attenuate slower eye movements and drift-related features, degrading the signal. A very low high-cut like 15 Hz could blunt rapid eye movement components, diminishing the sharpness of transients. Conversely, letting through up to 100 Hz doesn’t aggressively reduce noise. Therefore, the 0.3 Hz/35 Hz pairing offers the best balance for routine monitoring.

For routine EOG monitoring, you want to remove slow baseline drift while keeping the eye movement signal intact and still suppressing high-frequency noise. A low-frequency filter set at 0.3 Hz accomplishes this by attenuating very slow drift (like electrode drift or perspiration) without discarding the slower eye movements themselves. Pairing it with a high-frequency limit of 35 Hz provides a gentle low-pass effect that reduces high-frequency noise and muscle artifacts while preserving the main energy of eye movements, which mostly reside below a few tens of Hz. This combination yields a clean, interpretable EOG trace that reliably shows REMs and saccades.

Using a higher low-cut like 10 Hz would start to attenuate slower eye movements and drift-related features, degrading the signal. A very low high-cut like 15 Hz could blunt rapid eye movement components, diminishing the sharpness of transients. Conversely, letting through up to 100 Hz doesn’t aggressively reduce noise. Therefore, the 0.3 Hz/35 Hz pairing offers the best balance for routine monitoring.