Why is it important to maintain low impedances in electrode connections?

Maintaining low impedances in electrode connections is crucial primarily because it helps to decrease the chance of poor quality signals. Low impedance ensures that the electrical connection between the electrodes and the skin is strong and stable, which is essential for accurate readings in polysomnography. High impedance can introduce noise, artifacts, and signal degradation, leading to unreliable data that can compromise the effectiveness of sleep studies.

When electrode impedances are kept low, the electrical activity that is being recorded—such as brain waves, muscle activity, and eye movements—can be captured more clearly, allowing for precise diagnostics. This clarity is necessary for healthcare professionals to accurately assess a patient's sleep quality and diagnose potential sleep disorders.

Other benefits may indirectly support this process, such as improved patient comfort or equipment longevity, but the primary reason remains the enhancement of signal quality, making option B the most relevant choice.