The Lumosity program is designed to train your brain, and improve your memory, attention, and problem-solving skills. The app is free for iOS and Android, but you need a paid subscription to get the most out of it.
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Lumosity Performance Index
The app measures your progress with the Lumosity Performance Index, a measurement of your game scores in specific cognitive skill areas, such as Attention or Memory. If you have a paid Lumosity subscription, you can compare your LPI with the entire Lumosity community.