The USA and the European Union invest since the beginning of the millenium billions of dollars and euros into brain research. As a result of this research perfect maps of the brain were developed, including the areas of the brain that control the activity of different body organs or parts where higher brain activities, such as speech and thoughts, are taking place. The brain activities corresponding to different actions in those areas were also deciphered.
Thanks to the knowledge of specific locations of different centers in the brain and frequencies of the neuronal activity in them, teams of physicians are now capable of helping many people who were in the past, for different reasons, unable to participate in a normal life. There exist prostheses, which are controlled directly from the brain centers that normally control the movement of the limbs (see this) and enable people, who lost them, to use the prosthesis in a way similar to the way normal people use their limbs. Higher brain activities were produced as well. In 2006 scientists placed into the brain of a completely paralyzed man an implant, which transferred the activity of his brain into different devices and enabled him to open his e-mail, control his TV set and control his robotic arm. Other paralyzed people were able to search the Internet, play computer games and drive their electrical wheelchairs (see this).
Thanks to extensive brain research, computers were taught to understand the neuronal activity so much so that they are now capable of using the activity of our brain to reproduce our perceptions. Canadian scientists demonstrated an experiment, where the computer could interpret the electroencephalographical recordings from the brain to produce the painting of a face that the subject of experiment was perceiving (see this).
In the opposite way the data, processed by the computer in the way that will make them intelligible for the nervous system, can be transmitted into the brain and produce there a new reality. When an implant is placed in the brain and connected to a camera, placed on spectacles, for people whose photoreceptors in their retina stopped working, the sight is at least partially restored. In this case the camera on the spectacles is transmitting into the implant light frequencies and the implant re-transmits them in frequencies which “understand” the neurons processing the visual perceptions (see this).