What is the most likely low frequency filter setting of channel 1?

The low frequency filter setting for channel 1 is typically chosen to eliminate slow-moving artifacts while still allowing important physiological signals to be captured. A setting of 1.0 Hz is commonly used in polysomnography to strike a balance between removing unwanted low-frequency noise such as movement artifacts and ensuring that relevant physiological signals, like delta waves during sleep, are retained for accurate analysis.

Using a 1.0 Hz filter means that frequencies below this threshold will be dampened, which can prevent muscle activity or other low-frequency noise from interfering with the interpretation of sleep stages. On the other hand, lower settings like 0.1 Hz or 0.5 Hz would remove even more low-frequency components, potentially obscuring critical sleep-related signals that are essential for an accurate assessment. Similarly, a setting of 1.5 Hz may cut off some of the lower delta frequency waves, which could be significant in certain sleep states. Thus, the choice of a 1.0 Hz low frequency filter setting supports optimal data quality for polysomnographic analysis.