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To date, neither a trailer nor even a still photo from the film, which tells the story of a disabled soldier who uses technology to inhabit an alien body on a distant planet, has been made public by Mr. Cameron or Fox. Dr. Mario Mendez, a behavioral neurologist at the University of California, Los Angeles, School of Medicine, said it is entirely possible that Mr. Cameron's work could tap brain systems that are undisturbed by conventional 2-D movies. One, he said, is a kind of inner global-positioning system that orients a person to the surrounding world. "Three-D demonstrably creates a space that triggers this GPS; it's really very stimulating," Dr. Mendez said. He added that he had used virtual-reality therapy in working with soldiers at the Veterans Administration hospital in Los Angeles - and found himself jarred by his experience with a "virtual Iraq" simulation. "It was with me for days and days," Dr. Mendez said.

"In the shimmering fantasy realm of the hit movie "Avatar," a paraplegic Marine leaves his wheelchair behind and finds his feet in a new virtual world thanks to "the link," a sophisticated chamber that connects his brain to a surrogate alien, via computer. This type of interface is a classic tool in gee-whiz science fiction. But the hard science behind it is even more wow-inducing. Researchers are already using brain-computer interfaces to aid the disabled, treat diseases like Parkinson's and Alzheimer's, and provide therapy for depression and post-traumatic stress disorder. Work is under way on devices that may eventually let you communicate with friends telepathically, give you superhuman hearing and vision or even let you download data directly into your brain, a la "The Matrix." Researchers are practically giddy over the prospects. "We don't know what the limits are yet," says Melody Moore Jackson, director of Georgia Tech University's BrainLab. "

The ICT is a research lab for gaming technology that specializes in creating products for the United States military, including a city management trainer called UrbanSim and a negotiation trainer called BiLAT. Virtual Iraq was designed as a PC-based form of exposure therapy for Army veterans who served in Iraq and came back with post-traumatic stress disorder (PTSD).