Which filter combination would best record 3/second spike and slow wave discharges?

To accurately capture 3/second spike and slow wave discharges, the choice of filter settings is critical in ensuring that the relevant frequency components of the EEG signal are recorded without distortion or loss of important features.

The correct combination of a high frequency filter (HFF) set at 70 Hz and a low frequency filter (LFF) set at 1 Hz is well-suited for this type of pattern. This is because the spike and slow wave discharges typically have specific frequency characteristics—often seen in conditions like epilepsy. The spikes may range into the higher frequency spectrum, and the slow waves, typically much slower, fall within the lower frequency range.

By selecting a 70 Hz high frequency filter, you allow for the capture of fast activity, such as spikes, while the 1 Hz low frequency filter ensures that very slow waves are not cut off. This combination provides a wide enough bandwidth to effectively highlight the 3 Hz discharges while maintaining clarity in both the rapid spike features and the slower wave components.

In contrast, other combinations would either filter out essential components of the discharges or limit the ability to adequately record the patterns of interest. For instance, setting the high frequency limit lower than 70 Hz may obscure spike activity