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Researchers from the Massachusetts Institute of Technology have the gene that could people traumatic experiences. They say the research could people with painful memories. Soldiers, crime victims and people who natural disasters are some of the people this research could help. Many of these people from very bad stress because of their memories. It is an illness post-traumatic stress disorder (PTSD). The scientists the memory gene in mice. They hope that one day they can painful memories in humans. They think they can upsetting memories with more positive thoughts and feelings. This would help millions of people who suffer from PTSD.

The head researcher, Li-Huei Tsai, many tests to make mice forget their fear. Scientists the mice into a cage and them a small electric shock. After many shocks, the mice afraid of the cage. They were stressed when they it. Once the mice had "cage shock," the scientists put the mice in the cage again but didn't give them an electric shock. After a period of time, the mice no longer the cage. Positive feelings their stress and fear. The scientists at the brain activity when the mice afraid and when they were not afraid. They were surprised to find the gene that replaced old memories with new ones. They will now to find this gene in humans.