What term describes the arrangement of electrodes used to record multiple signals in polysomnography?

What term describes the arrangement of electrodes used to record multiple signals in polysomnography?

• A. Montage
• B. EEG
• C. EOG
• D. EMG

Answer: (A)

Montage refers to how electrode placements are wired together to create the multiple channels recorded in a sleep study. It defines which sites are measured and how signals are referenced or differenced—whether using bipolar pairs (one site minus another) or referential schemes—so you can capture brain activity with EEG, eye movements with EOG, and muscle tone with EMG all at once. A standard polysomnography setup uses a specific montage to derive several EEG channels (frontal to central, central to occipital, etc.) along with EOG and chin EMG, giving a coherent, multi-signal recording. The other terms describe the types of signals themselves, not how they are arranged for simultaneous recording. EEG is the brain signal, EOG tracks eye movements, EMG tracks muscle activity; montage is the arrangement that enables measuring multiple signals together.

Montage refers to how electrode placements are wired together to create the multiple channels recorded in a sleep study. It defines which sites are measured and how signals are referenced or differenced—whether using bipolar pairs (one site minus another) or referential schemes—so you can capture brain activity with EEG, eye movements with EOG, and muscle tone with EMG all at once. A standard polysomnography setup uses a specific montage to derive several EEG channels (frontal to central, central to occipital, etc.) along with EOG and chin EMG, giving a coherent, multi-signal recording. The other terms describe the types of signals themselves, not how they are arranged for simultaneous recording. EEG is the brain signal, EOG tracks eye movements, EMG tracks muscle activity; montage is the arrangement that enables measuring multiple signals together.