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What happens to the brain before death?

Patient dies during EEG scan.
The patient is 87 years old. He suffers from epilepsy. Electroencephalography or EEG was being performed. The patient had a heart attack while the scan was going on. He died. EEG scanning is done for 900 seconds. However, significant brain behavior is seen from 30 seconds before the heart stops to the next 30 seconds.

It is seen that gamma waves increase in the brain just before and after death. When we dream, remember old memories or read something with deep attention or pray, at that time 30-100 Hz electrical waves are generated in the brain. These waves are called gamma waves. Do not think of them as gamma rays of physics. Gamma waves were detected in the EEG test.

The experiment was led by Dr. Ajmal Zimmer, a neurosurgeon at the University of Louisville.  The research paper was published in the journal Frontiers in Aging Neuroscience.