A diagnosis of exclusion: Transient global amnesia, often called T.G.A. It is a temporary lapse in memory that can never be retrieved. Its as if the brain is on overload and takes a break to recharge, Dr. Brockington said in an interview. She likened it to rebooting a computer to eradicate an unexplainable glitch. Those with T.G.A. do not experience any alteration in consciousness or abnormal movements. Only the ability to lay down memories is affected. All other parts of the brain appear to be working normally.