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Many would have thought that by playing computer games will improve memory and other skills because it stimulates brain activity.

However, in a six-week study, experts found people who played online games designed to improve their cognitive skills didn't get any smarter.

Researchers recruited participants from viewers of the BBC's science show Bang Goes the Theory. More than 8,600 people aged 18 to 60 were asked to play online brain games designed by the researchers to improve their memory, reasoning and other skills for at least 10 minutes a day, three times a week.

They were compared to more than 2,700 people who didn't play any brain games, but spent a similar amount of time surfing the internet and answering general knowledge questions. All participants were given a sort of IQ test before and after the experiment.

Researchers said the people who did the brain training didn't do any better on the test after six weeks than people who had simply been on the internet. On some sections of the test, the people who surfed the net scored higher than those playing the games.

The study was paid for by the BBC and published online Tuesday by the journal Nature.

Adrian Owen, assistant director of the Cognition and Brain Sciences unit at Britain's Medical Research Council, the study's lead author suggests in his statement that playing games are just for fun but not to improve IQ.

One maker of brain games said the BBC study did not apply to its products. Steve Aldrich, CEO of Posit Science, said the company's games, some of which were funded in part by the US National Institutes of Health, have been proven to boost brain power.

Computer games available online and marketed by companies like Nintendo that supposedly enhance memory, reasoning and other cognitive skills are played by millions of people worldwide, but few studies have examined if the games work.

There is precious little evidence to suggest the skills used in these games transfer to the real world, said Art Kramer, a professor of psychology and neuroscience at the University of Illinois. He was not linked to the study and has no ties to any companies that make brain training games.

Instead of playing brain games, Kramer said people would be better off getting some exercise. He said physical activity can spark new connections between neurons and produce new brain cells. Fitness changes the building blocks of the brain's structure, he said.

Still, Kramer said some brain training games worked better than others. He said some games made by Posit Science had shown modest benefits, including improved memory in older people.

Other experts said brain games might be useful, but only if they weren't fun.

If you set the level for these games to a very high level where you don't get the answers very often and it really annoys you, then it may be useful, said Philip Adey, an emeritus professor of psychology and neuroscience at King's College in London.

He said people should consider learning a new language or sport if they really wanted to improve their brain power. To stimulate the intellect, you need a real challenge, Adey said, adding computer games were not an easy shortcut. Getting smart is hard work.