Microelectrodes help to find out the word made by a person. Free Technical Library News

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Microelectrodes help to find out the word made by a person

25.10.2010

Someone considers telepathy science fiction, someone charlatanism. Scientists do not get tired of looking for a way to read minds. They are driven not only by scientific curiosity, but also by the desire to help paralyzed people communicate with the outside world.

Another success was achieved by physiologists from the University of Utah, led by Associate Professor Bradley Greger. One of the patients of the clinic, suffering from epilepsy, agreed to take part in their work. To combat the disease, his skull was opened and several electrodes were installed on the surface of the brain - the signal applied to them extinguishes the seizure in the bud. Greger and his colleagues added 16 more microelectrodes to them, which were placed above the area responsible for speech.

Then the patient began to think of words - there were 10 words in total: "yes", "no", "warm", "cold", "hunger", "satiation", "hello", "bye", "more", "less" , - and the electrodes recorded the electrical impulse arising from each of them. After that, it's time to decrypt. When choosing from two words - "yes" and "no" - luck smiled at the researchers in 76-90% of cases.

Increasing the number of words to ten reduced the probability of correctly deciphering the electrical signal to 28-48%, that is, it was at least three times greater than the 10% that would have been obtained by random guessing.

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Smell left and right 03.04.2000

As psychologists from the University of California (USA) have shown, the perception of smell depends on which nostril to inhale it.

Thirty-two volunteers were given eight common scents to smell, including lemon and mint. The subjects had to answer questions about the pleasantness or unpleasantness of the smell and what it actually smells like. The snuff was taken first with one nostril, then the other. It turned out that the right nostril tends to evaluate odors more positively than the left. But the left nostril more accurately determines the origin of the smell.

Experimenters believe that the differences found are associated with long-known differences in the activity of the two hemispheres of the brain. Each nostril sends signals to its own hemisphere. The left is more rational, reasonable, the right is more emotional. In accordance with this, the nostrils evaluate odors.

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