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Brain Researcher Looks into Strength Handedness

Narrator: Are you left-handed or right-handed? This is Science Today. A team of researchers at the University of California, Riverside has been using magnetic resonance imaging to map the brain structures of volunteers to gain more insight into the human brain. Psychologist Christine Chiarello says they've created a database from their studies that will be used for the next five, if not ten years.

Chiarello: One of the things that we're looking at now has to do with strength of handedness. A lot of people make distinctions between left-handers and right-handers. And in fact, handedness is a continuous phenomena. So, you could have someone who's weakly right-handed or someone who's strongly right-handed and so on. What we are finding is that there are some differences in brain organization between people who have a very, very strong hand preference - whether it's right or left and people who have weaker hand preferences. And so one of the areas that we will be exploring more in the future is to try to spell out one some of those difference sare.

Narrator: For Science Today, I'm Larissa Branin.