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What do scientists actually is to reconstruct the words by waves in the brain of a patient who is thinking about the words in question.
To do this, scientists used a technique that relies on the collection of electrical signals directly from the patient's brain. Based on these signals, scientists use computer models to reconstruct the words that are being considered by the patient.
Studies conducted by mengimplantasi electrodes in the brains of patients. Patients were asked to listen to the conversation, while the scientists analyzed the frequency of the sound to determine what patients think.
"We focus on how the brain processes speech," said Brian Pasley, researchers from the Helen Wills Neuroscience Institute at the University of California, Berkeley, California.
"Most of the information in a conversation between 1-8000 Hertz frequency. In essence, the brain to process sounds with different frequencies in different brain locations," said Pasley.
By detecting how and where the brain "put: noise in the temporal lobe (part of the brain in charge of the hearing), scientists can know the word is heard.
"When certain brain areas are activated, we know it is associated with the sounds of certain frequencies are heard," said Pasley told AFP on Wednesday (02/01/2012). "So we can use mapping and brain activity to a certain frequency sound meresintesis we're guessing," said Pasley.
Which is then mapped the structure of the scientist. The sound of "S" is a high frequency appear in certain areas of the brain. While the sound "U" appears in other parts of the brain.
To conduct this study, scientists asked 15 patients undergoing surgical tumor and epilepsy to become a volunteer.
The study itself for the first time in humans. Previously, the study has been done on the mongoose to see the voice that is heard by the animal.
Research will be continued to determine whether the process of listening to the words with the imagined voice or words.
Information obtained in this study and the follow-up can be very useful to know what he was thinking of people who have difficulty speaking.
Mindy McCumber of Florida Hospital in Orlando, as quoted by the BBC on Wednesday, saying, "As a therapist, I could see the potential implications for the restoration of communication for a variety of diseases."
"It's a big impact for patients who have spoken in the mechanism of biological damage due to stroke, Lou Gehrig's disease and unable to speak," added Robert Knight, professor of psychology and neuroscience from the University of California Berkeley.
The results of this study was published in the journal PLoS Biology in January 2012.
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