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Brain-computer interfaces could mean more freedom for the disabled

This is the voa speical english technology report.

since the nineteen severnties ,scientists have been searching for ways to link the brain with computers. Brain-computer interface, or BCI,technology could help people with disabilities send comands to machines.

Recently,scientits demonstrated a small robotic vehicle direted by a person's thoughts. the demonstration took place at the swiss embassy in washington. joseMillan and Michele Tavella developed the system. Mr>Tavella can even talk as he watches the vehicle and guides it with his thoughts.

Michele tavella: this is very ,very easy .that's the simplest part we could say because moving one hand or the other is a very , very common task. ther is no workload . it's very ,very simple.

mr.tavella is a resercher at the federal polytechnic school in lausanne, switzerland. in laboratory, he can operate a wheelchair just by thinking about moving hisleft or right hand.

professor millan is the team leader. he says systems like thoes being developed in lausanne and other places may be available in less than ten yeas.

jose millan" the brain-machine interface is a system that alllows disabled people , people suffering from physical disabilities to communicate with external world and also to control devices.

our brain has billions of nerve cells. these send signals through the spinal cord to the muscles to give us the ability to move. but spinal cord injuries or other conditions can prevent these week electrical signals from reaching the muscles.

the reaserchers designed a special cap for the user. this head cover captures the signals from the scalp and redireccts them to a computer. the compuer interprets the signals and commands the motorized wheelchair. the wheelchair also has two cameras that

identify objects in its path. they help the computer react to commands from the brain.

professor millan says scientists keep improving the computer software that identifies brain signals and turns them into simple commands.

jose millan: the practical possibilities that brain-machine interfaces offer to disabled people can be grouped in two categories:

communication, and controlling physical devices and virtual devices. one example is the wheelchair.

he says his team has set two goals.

jose millan: what we want is to bring this technology out of the lab and this has two components. first is testing with real patients,

so as to demonstrate that this is a feasible technology they can benefit from .and the second aspect of that is to guarantee that they can sue the technology over long periods of time.

and that's voa special english technology report. transcripts , mp3s and podcasts of our reports are at voaspecialenglish.com.

you can also find us on facebook and youtube at voa learning english. i am robet cohen.