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New Tool Shows How a Child's Brain Grows

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March 13, 2000 (Atlanta) -- Is my child normal? A new brain mapping technique promises to give pediatricians a way to answer -- and also may point to the best times to teach children language and motor skills.

"Between the ages of 3 and 15 there is almost a forest fire of growth beginning at the front of the brain and moving back to the center," the co-developer of the technique, Paul M. Thompson, PhD, tells WebMD.

Thompson and coworkers at the UCLA Laboratory of Neuroimaging (LONI) used a tool known as magnetic resonance imaging (MRI) to create 3-dimensional pictures of children's brains. The researchers used several of these pictures -- taken from two weeks to four years apart -- to create a single, computer-generated color image that shows exactly where growth is taking place in a child's brain. These images can be viewed on the LONI web site at http://www.loni.ucla.edu/~thompson/JAY/Growth_REVISED.html

Because of the limitations of current MRI technology, which requires a person to sit very still for eight minutes, it was impossible to map the brains of normal children younger than 3 years of age. However, the researchers did manage to obtain images from one 3-year-old.

The results showed three distinct periods of brain growth. During the first period, between the ages of 3 and 6 years, there is furious growth in the front of the brain that controls planning and organization. Child neurologist Wendy Gayle Mitchell, who was not connected with the MRI studies, tells WebMD that as the front of the brain develops, a child begins to be able to interpret things instead of just responding to them. "Instead of just doing and seeing, you interpret; you can put things in an orderly way," she says. "You develop an awareness of your own ability to think." Mitchell is a professor in the Keck School of Medicine at the University of Southern California.

In the second period of brain growth, at age 6-13 years, the high growth rate moves back toward the middle of the brain to an area involved in language skills. "It appears clear that because language systems grow at such a tremendous rate at these ages, that [age 6-13] would be a key period to teach languages," Thompson says.

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