What is commonly used to refer to the acceptable range of electrode impedances in EEG?

The term "balanced impedance" is used to describe the acceptable range of electrode impedances in EEG because it signifies that the impedance levels at all electrode sites are consistently low and within a range that ensures optimal signal quality. In EEG practice, maintaining balanced impedance is critical for acquiring clear and accurate brain electrical activity. If the impedances are too high or uneven across the electrodes, it can lead to poor signal quality, artifacts, and difficulties in interpreting the recorded data. Balanced impedance helps ensure that the electrical potentials from the brain are captured effectively without interference from external factors or noise, enabling a more reliable interpretation of the EEG results. This balance signifies that the electrodes are functioning properly and that the system is well-grounded.