Which scenario is most likely to cause electrode popping?

Electrode popping is often associated with issues related to the attachment and grounding of the electrodes on the patient’s skin. When electrodes are not firmly attached to the face or scalp, it can lead to fluctuations in the impedance at the electrode-skin interface. This situation may allow for the generation of artifact signals that resemble popping sounds, which can interfere with the clarity of the recorded data.

Additionally, if there is a poor patient ground connection, it can also contribute to this popping sound. A weak ground connection may result in electrical noise, which further disrupts the signal quality and may be perceived as popping.

Thus, the choice that indicates both the lack of proper electrode attachment and a poor ground connection is correct, as both scenarios increase the likelihood of electrode popping due to changes in electrical impedance and noise due to grounding issues.