What role does an impedance meter serve in EEG practices?

An impedance meter plays a crucial role in EEG practices by measuring electrical resistance, which is essential for ensuring the quality and reliability of the EEG recordings. In EEG setups, electrodes must make good contact with the scalp to accurately capture the electrical activity of the brain. High impedance at the electrode-skin interface can lead to poor signal quality, artifacts, and inaccurate readings. By using an impedance meter, technicians can assess the resistance levels and verify that they fall within acceptable ranges. This allows them to troubleshoot any issues related to electrode placement or connectivity before beginning a brain activity recording. Ensuring low impedance helps in obtaining clear and interpretable EEG signals.