In EEG, what do the terms "montage" and "referential" refer to?

The term "montage" in the context of EEG refers to the arrangement or configuration used for placing electrodes on the scalp, which determines how brain activity is recorded and analyzed. Different montages can be employed depending on the clinical or diagnostic goals of the EEG. The "referential" montage specifically involves referencing the activity of each electrode against a common reference point, usually an electrode placed at a location that is considered stable, such as the earlobe or vertex, rather than referencing between two adjacent electrodes. This influences the interpretation of the EEG signals recorded, as it affects how the brain's electrical activity is viewed.

In summary, understanding montage and referential techniques is critical as these configurations directly impact the quality of the EEG data and its clinical significances. Other options might refer to aspects related to EEG but do not accurately capture the specific definitions that "montage" and "referential" encompass in the context of electrode placement and referencing for recording.