Release date: 2010-04-21
The computer can handle multiple tasks at the same time, can the human brain be? French researchers have found that the human brain can only handle two tasks at the same time, and "one heart and three uses" will make things mess. The results of the study were published in the latest issue of the American Journal of Science.
Spelling test A French research team recruited 32 volunteers to combine several English letters listed on the computer screen into words. At the same time, the researchers used magnetic resonance brain function imaging to scan the brain of the subject and observe the activity of the component of the brain's "drive system", the medial prefrontal cortex.
First of all, all the capital letters appear on the computer screen, and the subjects who correctly spell out the words can get material rewards. The researchers found that the higher the prize amount, the more active the activity of the medial prefrontal cortex.
The second test is more difficult, lowercase letters appear at the same time, and the subject must spell both uppercase and lowercase letters into words. As a result, the subjects did not bother, and their activity of brain activity continued to increase with the increase in bonuses. The scan shows that the frontal lobe will assign the task to the left and right hemispheres of the brain, so that the two parts deal with two different tasks.
Finally, the researchers added a set of letters and the accuracy of the subject's match was significantly reduced. Etienne Kashlan, head of the research project and the Paris Teachers College, said: "The subjects seem to always forget one of the three tasks."
One heart and one mind The human brain has only two frontal lobes. In the face of two tasks, the medial prefrontal cortex automatically divides the task, making "one heart and two uses" a reality. But if you try to "use one heart and three things", things will get worse.
“This research may explain why people are at a loss when faced with multiple choices,†said Kashlan. Previous studies have shown that people are always willing to make “two or the other†binary choices. “When choosing more than two People will lose their rationality and be overwhelmed. This may be related to the brain being able to do 'double task processing'."
The neurologist Réne Marouva of Vanderbilt University in the United States believes the discovery is "surprising." He said that this would suggest that people try to handle more than two things at the same time, such as viewing the e-mail while writing a report. However, if the message needs to be replied, the brain may be overwhelmed.
Awaiting discussion David Mayer studies multitasking at the University of Michigan. In his view, this study does not prove that the brain cannot handle three tasks at the same time.
Meyer believes that people will have an abnormal reaction in the front and rear of the life and death, so that they can perform "multitasking."
"Kashland's research is just using money as a stimulus, so the conclusion is debatable," Meyer said. "But I am also confused as to why sometimes human brain activity instructions are out of touch with their actual behavior."
For example, he said that material stimulation can improve human brain activity, but this increase in activity does not make people become faster and more accurate when dealing with multitasking.
Meyer believes that research needs more powerful incentives. "If there is no external stimulation, 'one heart and one mind' is an idiotic dream." Meditech Medical Network
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