What is the recommended sampling rate for EEG channels?

The recommended sampling rate for EEG channels is 500 Hz because this rate effectively captures the range of frequencies present in brain wave activity, which typically includes delta, theta, alpha, beta, and gamma waves. To accurately analyze EEG signals, a minimum sampling rate of twice the highest frequency of interest is required, according to the Nyquist theorem. Given that EEG activity can reach frequencies of up to about 60 Hz or more, a sampling rate of 500 Hz provides a sufficient margin, ensuring that the data is acquired with adequate resolution and fidelity. This allows for proper signal processing and interpretation, making it essential for accurate diagnosis and monitoring in a clinical setting.