What is the MOST important instruction to give a client during an EEG?

Remaining still is the most important instruction to give a client during an EEG because this test measures electrical activity in the brain, which can be affected by movement. If the client moves, it can create artifacts in the recording, making it difficult to obtain clear and accurate results. The EEG is designed to capture subtle brain wave patterns, and any movement can obscure these signals, potentially leading to misinterpretation of the brain's activity.

While speaking if feeling uncomfortable, taking deep breaths, or closing their eyes might also be beneficial, they do not hold the same level of significance as the need to remain still during the test. Movement can significantly compromise the validity of the EEG results, so instructing the client to stay still is crucial for ensuring the test's effectiveness.