What is another name for a 60 Hz filter used in EEG analysis?

The term "notch filter" specifically refers to a filter designed to eliminate a narrow band of frequencies from a signal. In the context of EEG analysis, the 60 Hz filter is typically used to reduce interference from electrical noise, such as that from power lines, which operates at 60 Hz in some countries. By employing a notch filter at this frequency, the EEG signal can be cleansed of unwanted noise while preserving the integrity of the other frequency components of the EEG data.

A notch filter is particularly effective because it selectively attenuates a specific frequency range without affecting adjacent frequencies, making it ideal for targeting the narrow band of 60 Hz interference. This functionality is essential in clinical and research settings to ensure the accuracy and quality of EEG readings, allowing for more reliable interpretation and analysis of brain activity.

In contrast, low pass, high pass, and band pass filters serve different purposes, focusing on broader frequency ranges rather than zeroing in on specific frequency interference like the notch filter does.