What is the recommended impedance level for EEG electrodes?

The recommended impedance level for EEG electrodes is indeed less than 5 kohms. Maintaining an impedance below this threshold ensures good signal quality and reduces noise in the EEG recordings. High impedance can introduce artifacts and decrease the reliability of the data collected during a sleep study. This lower impedance level allows for better electrical contact between the electrode and the scalp, enhancing the accuracy of the recorded brain waves.

In clinical practice, it's common to aim for electrode impedance levels around or below 5 kohms, as this has been shown to yield clearer, more interpretable EEG signals, particularly important during sleep studies where brain activity may be subtle and prone to interference.