An American clinical test has shown that a South Korean device for brainwave management improves concentration and attention.

Medical researchers at Thomas Jefferson University in Philadelphia said Friday that tests on 39 subjects with MC Square and placebo products at the same time showed the effectiveness of the device in boosting brain capability.

Late last month, the network NBC featured details of the test results and rival ABC will soon follow suit.

The device's manufacturer, Daeyang E&C, says MC Square boosts concentration and relaxes the mind by using light and sound to induce positive brainwaves.