Every so often, seemingly normal people suddenly walk out of their lives and disappear, with no recollection of who they are, where they are from or what their previous life was like. It is the stuff of fiction, but it happens in real life too.
Last year a lawyer from Westchester County in New York -- a 57-year-old husband and father of two, Boy Scout leader and churchgoer -- left the garage near his office and disappeared. Six months later he was found living under a new name in a homeless shelter in Chicago, not knowing who he was or where he came from.
Library searches and contact with the Chicago police did not help the man. His true identity was uncovered through an anonymous tip to America's Most Wanted. But when he was contacted by his family, he had no idea who they were.
On the fictional side is a play called Fugue, now on stage at the Cherry Lane Theater in New York. In it, a psychiatrist interviews a woman found wandering homeless in Chicago. She does not know her name and can recall nothing about her life before landing in Chicago.
SUDDEN JOURNEYS
The rest of this most interesting play by Leonora Thuna is an exploration of a rare but intriguing emotional disorder, known technically as dissociative fugue or dissociative amnesia.
People with this problem suddenly and unexpectedly take leave of their usual physical surroundings and embark on a journey that can last as little as a few hours or as long as several months.
During the fugue state, individuals completely lose their identity, later assuming a new one. They don't know their real names or anything about their former lives, and they do not recognize friends or family.
While loss of memory can occur for many reasons, dissociative fugue has no direct physical or medical cause. Rather, it is precipitated by a severe stress or emotionally traumatic event that is so painful the mind seems to shut down and erase everything, like a failed computer hard drive.
But unlike a computer whose unsaved information is lost forever, most if not all patients suffering from dissociative fugue eventually recover their memories, typically just as suddenly as the memories disappeared.
While in the fugue state, people are unaware that their identity and memory have been lost, said David Schacter, professor of psychology at Harvard. They wander off, often traveling far from home. It is only when they are forced to reveal some piece of biographical information that they realize they do not know who they are.
In a telling case detailed by Berton Roueche first in the New Yorker and later his book The Medical Detectives, Volume II more than a half-century ago, a man who felt increasingly trapped in his father-in-law's business one day failed to show up at the store in Boston and later found himself in New York. Not until he had to provide his name for a hotel did he discover he did not know who he was.
After many failed attempts to uncover his identity, his past revealed itself while he was being quizzed by a doctor at Bellevue Hospital, he recalled: "All of a sudden, I knew, I remembered. I jumped up and shouted. I yelled: `I know -- I can remember. I remember my wife's name. It's Mildred. We live in Boston. I can even tell you the address. And my name is Uhlan. Walter Uhlan.'"
Elkhonon Goldberg, clinical professor of neurology at New York University and the author of three books on the human mind, said that some underlying neurological problem is the usual cause of amnesia. When amnesia has a physical basis, memory loss is usually not complete, but rather covers a part of someone's life. The more recent memories are often lost, while memories of more distant events are preserved.
DIAGNOSIS
When examining a patient with memory loss that has no obvious physical cause, the first step, Goldberg said, is to look for a neurological cause like a head injury, stroke, viral encephalitis or temporal lobe epilepsy. In such cases, in addition to incomplete memory loss, there is usually a loss of individual facts like biographical information. However, when memory loss includes generic knowledge about whole classes of things, like how many wings birds have, the underlying cause is more likely to be psychogenic, Goldberg said.
When amnesia has an organic cause, people's memories of who they are usually are not disrupted, Schacter said. Nor are memories usually lost of events that occurred before the physical problem. But such people may be unable to form new memories.
And sometimes cases of fugue have a precipitating psychological cause along with some form of underlying brain damage that is revealed, say, through a functional MRI or PET scan, according to Morris Moscovitch, a psychologist at the University of Toronto.
Another challenge clinicians face in diagnosing amnesia, Schacter said, is to differentiate between genuine cases of lost memory and the concocted amnesia of malingerers -- people who are fleeing financial problems, for example, who have committed a crime or who simply wish to gain notoriety.
Neuropsychological tests performed by experts can often pinpoint the malingerers who may do so poorly on certain tests that they are obviously faking their answers.
Other checks for malingering include assessing whether patients are making a genuine effort to answer questions correctly and whether there are apparent motives for pretending they do not know who they are.
POST-TRAUMATIC STRESS
In the case of the Westchester lawyer, who had lost all memory of his former life, his wife gave background information suggesting that his amnesia may have resulted from post-traumatic stress.
He was a Vietnam War veteran who happened to have walked between the twin towers of the World Trade Center on Sept. 11, 2001, minutes before the first plane hit. He subsequently experienced a return of painful memories of his war experience and required treatment for depression.
The playwright, Leonora Thuna, was first attracted to the subject of fugue after seeing an article in the Los Angeles Times. The police picked up an attractive blonde woman after she was found wandering the streets of Los Angeles with no idea of who she was or how she got there. After her picture appeared in the paper, her family recognized her and came to get her, but when they arrived she had no idea who they were, either.
Similar cases have occurred elsewhere, like the 40-year-old man from Olympia, Washington, who somehow made his way to Denver, where he wandered the streets alone and confused until he finally asked doctors and the police to help him discover his identity.
In researching fugue states, Thuna learned something reassuring: "You never lose your memory. It's always there. It just falls out of the file cabinet."
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