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Brain Games: Do They Really Make Kids Smarter?

It sounds like a great idea: a game to exercise the mind. But, do these games pay off and actually increase a child's intelligence? Experts give insights into these games and if they really work.

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Picture this: Your baby is sitting happily in front of a TV set while colorful images set to classical music flash before her eyes. What she's seeing and hearing nourishes her brain – building her intelligence even before she can utter, "Mama."

That was the promise of various brain-boosting videos that became all the rage a few years ago. It was the era of Baby Einstein.

Then the idea behind the videos' smarts-building power was debunked. The company that produced them even offered refunds to unhappy customers.

It's no wonder that Baby Einstein videos became popular: They tapped into an idea psychologists have been exploring for years – that somewhere in all the research into how the brain works, aka neuroscience, there's a key to increasing brain power – something parents could use with their kids to bulk up intelligence. Your kids can strengthen their muscles with more exercise, right? So why not their brains, too? Shouldn't there be exercises for the brain?

Several companies, including Lumosity, now offer brain-training games built on just this idea – that the brain can be conditioned in the same way you would approach exercising your body. It's mental fitness. But the real question is, "Do these games really work, or is this another craze that won't stand the test of time?" The answer depends on whom you ask.

What exactly is 'intelligence'?

To answer the question about whether brain-boosting games really work, you need to understand a bit about how psychologists approach intelligence. Experts see overall intelligence as the ability to solve new problems and the ability to learn, explains D. Zachary Hambrick, Ph.D., a professor of psychology at Michigan State University.

Here's where things get a little complicated: Psychologists talk about intelligence as two different parts that work together, although they're not entirely agreed on exactly how they work together. There's general agreement on one part: crystallized intelligence. This piece of the puzzle is familiar for most of us. It's the knowledge your child learns through experience. All those spelling tests and endless math flash cards? That builds up your child's crystallized intelligence. She draws on that pool of knowledge to keep learning.

The other part of intelligence is what's called fluid intelligence. "Fluid intelligence is the ability to solve novel problems where you don't have the answer stored in your memory," says Hambrick. So if your child hasn't come across a certain math problem before, how does he go about solving it? Or, when attempting to understand and pronounce a new word that he's never heard before, how does he sound it out and figure out what it means? This is the work of his fluid intelligence.

Sounds easy enough, but there's another piece to the intelligence puzzle, according to psychologists. While you can improve your child's crystallized intelligence, fluid intelligence has been thought of as fixed. Unchangeable. You're born with it like you're born with brown eyes or green. No amount of training changes the color of your eyes. And there's more – the stronger your fluid intelligence, the better able you are to use crystallized intelligence.

But what if science found a way to tap into fluid intelligence? To improve it through training – that would make big news. And it did. 

The rising popularity of brain training games

The world of psychology was abuzz when a study seemed to show just that – fluid intelligence could be increased through training.

The 2008 study reported that playing certain brain-training games led to a rise in person's IQ. In other words, there was a direct connection – "the more training, the more improvement." Fluid intelligence was trainable.

So just how did these brain-training games work? They improved a person's working memory. Think of working memory as a sort of mental blackboard in your brain that helps you keep ideas straight and your attention centered, so you can learn even in the face of distractions. The breakdown: Tapping into working memory in turn feeds into building your fluid intelligence, which then gives you a better overall intelligence. Whew! All of that adds up to this idea: Play the game and see your IQ scores climb.

"This is something that psychologists have been interested in a long time – brain training," explains Hambrick. "In the last 10 years, there's been a great deal of enthusiasm about neuroscience we can use. So when this study came out that sort of started this recent brain-training craze, it created a big stir. As a researcher I thought, 'I've got to replicate that.'"

Hambrick, along with other researchers, tried to copy the study to see if they could mimic the results (a key step in scientific circles for proving that an idea holds true). They couldn't. Other studies followed that pointed out flaws in the 2008 study. The main issue was this: Sure, people who used a brain-training game improved their test scores. But on one test. One skill. Those results didn't seem to transfer into other areas. It would be like licking a strawberry lollipop and expecting that at some point you'd also be able to taste watermelon and cherry if you learned to lick the right way.

"You're only testing proficiency in one single test," Hambrick says. "When you make a claim about general intelligence, it means that they're good about a lot of different tests."

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