Which of the following does not typically affect EEG results?

Static electricity does not typically affect EEG results because EEG recordings are primarily influenced by the electrical activity of the brain. While external factors can introduce interference or artifacts in the EEG signal, static electricity is generally less impactful compared to the other options.

Patient movement can cause significant artifacts in the EEG tracing, as movement can produce electrical noise that is picked up by the electrodes. Environmental noise, such as electrical interference from devices or background sounds, can also distort the readings. Medication effects are particularly relevant because certain medications can alter brain activity, potentially changing the EEG patterns observed. In contrast, static electricity, while it may cause slight changes in electrical charge, does not typically have a substantial or consistent impact on the brain’s electrical activity as measured by EEG. This is why it is considered the option that does not usually affect EEG results.