SEASON FINALE

SEASON FINALE OF �PRIMETIME: MEDICAL MYSTERIES� AIRS SEPTEMBER 6 ON ABC

This week �Primetime: Medical Mysteries� airs its final program of the summer limited series with reports on some of the rarest cases known to medicine today. While medical science has progressed exponentially, the series takes a look at the cases that still leave scientists and doctors with unanswered questions when trying to explain the human body. �Primetime: Medical Mysteries� airs on WEDNESDAY, SEPTEMBER 6 (10:00-11:00 p.m., ET) on the ABC Television Network.

First: How could a father not recognize his own children? It�s a condition known as face blindness, but people who have it can see faces perfectly well, they just can�t process what people look like. JuJu Chang reports on the neurological disorder Prosopagnosia, where people can�t distinguish faces -- including their own. During the report, Chang meets a college English professor who can�t even recognize her most prized students and who has a reputation for being aloof because she never says hello to friends on the street. The report also features a family afflicted with face-blindness, raising the question of the role that genetics play in the disorder. Until recently, most Prosopagnosia cases have been the result of stroke or brain injury, but now researchers say there may be a single gene to blame.

Then: For most couples their wedding day is unforgettable, but just three days after Sean McNulty married his wife, Amy Harrison, he couldn�t remember anything from his life. Sean and Amy were leaving for their honeymoon when he vanished from the airport. After days of searching, Sean was discovered by police wandering aimlessly near an abandoned hotel. But his disappearance was only the beginning of a baffling journey. He had forgotten everything from his past, including his marriage to Amy. Diagnosed with a severe case of amnesia, Sean had to get to know Amy all over again. Chris Cuomo reports on the brain injury responsible for the amnesia and what transpired to bring back Sean�s identity.

And: An all-new way of seeing� can doctors train a tongue to do what eyes can't? Bob Brown reports on a revolutionary device that could make it possible for blind people to navigate without a cane or a seeing-eye dog. The device is placed on the tongue to emit a slight pulse or shocking sensation as the blind person approaches obstacles. The pattern of shocks on a blind person�s tongue mimics the shapes they are approaching. Brown talks to a musician who has been blind since birth and follows him through an experimental maze. Will he see for the very first time -- with the help of a computer and electrodes on his tongue?

Also: Throughout the episode there will be clues to the latest installment of �You Be the Doctor.� The interactive segment allows viewers to assess medical clues and vote online for a diagnosis. At the end of the hour, the audience will learn if they chose the right answer.

Ann Reynolds and Terence Wrong are the senior producers of �Medical Mysteries.� Rudy Bednar is the executive producer.