阅读了松. Since the 1970s,scientists have been searching

      阅读了松.

      Since the 1970s,scientists have been searching for ways to link the brain with computers.

      Braincomputer interface (BCI) could help people with disabilities send commands

      to machines.

      Recently,two researchers,Jose Millan and Michele Tavella from the Federal Polytechnic

      School in Lausanne,Switzerland,demonstrated(展即兴)a small robotic wheelchair directed by

      a person's thoughts.

      In the laboratory,Tavella operated the wheelchair just by thinking about moving his left or

      right hand.He could even talk as he watched the vehicle and guided it with his thoughts.

      "Our brain has billions of nerve cells.These send signals through the spinal cord(脊髓)to

      the muscles to give us the ability to move.But spinal cord injuries or other conditions can

      prevent these weak electrical signals from reaching the muscles,"Tavella says."Our system

      allows disabled people to communicate with external world and also to control devices."

      The researchers designed a special cap for the user.This head cover picks up the signals

      from the scalp(头皮)and sends them to a computer.The computer 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.

      Prof.Millan,the team leader,says scientists keep improving the computer software that

      interprets brain signals and turns them into simple commands."The practical possibilities that

      BCI offers to disabled people can be grouped in two categories:communication,

      and controlling devices.One example is this wheelchair."

      He says his team has set two goals.One is testing with real patients,so as to prove that this

      is a they can benefit from.And the other is to guarantee that they can use the

       over long periods of time.

      1.BCI is a that can ________.

      A.help to update computer systems

      B.link the human brain with computers

      C.help the disabled to recover

      D.control a person's thoughts

      2.How did Tavella operate the wheelchair in the laboratory?

      A.By controlling his muscles.

      B.By talking to the machine.

      C.By moving his hand.

      D.By using his mind.

      3.Which of the following shows the path of the signals described in Paragraph 5?

      A.scalp→computer→cap→wheelchair

      B.computer→cap→scalp→wheelchair

      C.scalp→cap→computer→wheelchair

      D.cap→computer→scalp→wheelchair

      4.The team will test with real patients to ________.