If the low frequency filter is adjusted from 1 Hz to 5 Hz, what is the effect on a 2 Hz slow wave?

Adjusting the low frequency filter from 1 Hz to 5 Hz affects how signals within this range are processed. A low frequency filter attenuates frequencies that are below its cutoff point. When the cutoff frequency is set to 5 Hz, any signal below this threshold—including a 2 Hz slow wave—will experience significant attenuation because it falls within the range that the filter is designed to reduce.

Specifically, the purpose of a low frequency filter is to eliminate or reduce unwanted signals or artifacts that can interfere with the analysis of the data being collected. Since the 2 Hz slow wave is below the new cutoff frequency of 5 Hz, the filter will operate to diminish the amplitude of this wave, meaning it will not be recorded as effectively, leading to a loss of signal strength.

This level of attenuation is significant since the 2 Hz signal will be subjected to a reduction in amplitude, altering its original form and making it harder to analyze accurately. In a clinical or monitoring context, this can impact the interpretation of results as the presence and characteristics of the slow wave could become obscured.