And who was to say there wasn't something deeper than the electrical activity of the brain?

"It's like you had the chest open and were recording electrical activity from the surface of the heart."

Thus, it was only natural to assume that they would also display electrical activity.

It's based on engine heat and electrical activity, nothing visual, thank God.

Using radio signals, it directly measures the electrical activity of the heart.

The electrical activity of the brain in such circumstances is between 13 and 30 cycles per second.

They happen because of sudden, abnormal electrical activity in the brain.

Tests to look at electrical activity of nerves can also help with diagnosis.

This is the normal conduction of electrical activity in the heart.

These tests measure the electrical activity of muscles and nerves.