ECG electrodes measure the heart's electrical activity — they're placed on the chest, arms, and legs. EEG electrodes measure the brain's electrical activity — they're placed on the scalp. The medical electrode market forecast shows that ECG is the largest application, but EEG is the fastest‑growing, driven by the rise in epilepsy, Alzheimer's, and traumatic brain injury.

What's the difference? ECG uses fewer electrodes (10‑12) and is quick. EEG uses many electrodes (20‑32) and takes an hour. The medical electrode market analysis notes that the fastest‑growing end‑user segment is diagnostic centers, which offer both ECG and EEG services.

New technology: dry EEG electrodes that don't require conductive gel, making setup faster and more comfortable. And wireless EEG headsets for long‑term monitoring at home.

The bottom line: whether it's your heart or your brain, electrodes are watching. And that's a good thing — early detection saves lives.