Low frequency filters in EEG are also known as:

In the context of EEG, low frequency filters are designed to allow low-frequency signals to pass through while attenuating higher-frequency signals. This function is commonly referred to as a "low pass filter." Therefore, the correct understanding is that low frequency filters enable the recording of slower waveforms, which are critical in EEG analysis for capturing important brain activity such as delta and theta waves.

On the other hand, high pass filters serve the opposite function by blocking low-frequency signals and allowing high-frequency signals to pass through. Notch filters focus specifically on eliminating specific frequency bands, often used to remove power line interference (typically around 60 Hz), while EMG filters are utilized to reduce electromyographic interference from muscle activity. Understanding these definitions will clarify why low frequency filters are correctly associated with low pass filters in EEG practice.