What is the consequence of a high input impedance in EEG?

A high input impedance in EEG systems plays a crucial role in ensuring accurate readings from the brain. When the input impedance is high, it allows the EEG electrodes to effectively detect small electrical signals generated by neuronal activity without drawing significant current away from these signals. As a result, this characteristic minimizes the likelihood of noise interference, which can come from various sources, including electrical equipment, muscle movements, or environmental factors.

With reduced noise interference, the signal-to-noise ratio improves, leading to clearer and more reliable recordings of the brain's electrical activity. This quality is especially important in EEG recordings, where precision in capturing subtle changes in brain wave patterns is essential for accurate diagnosis and analysis. In essence, the high input impedance helps maintain the integrity of the brain signals being measured, resulting in better quality data for interpretation.