Electroencephalogram tests, or EEGs, are commonly used to diagnose epilepsy and sleep disorders. But researchers may have found a new application for the widely used technology: detecting brain activity in comatose patients.
At first, he would see a colorful circle. It would grow a shimmering, flashing tail "dripping" down, which he compared to fireworks. "It's beautiful!" he said of one of these episodes -- but they gave him headaches, blinded him when they occurred and left a visual deficit in the right field of his vision for minutes after they subsided.
