The world's largest dementia research experiment, which takes the form of a video game, has indicated the ability to navigate declines throughout life. <br/><br/>The findings, presented at the Neuroscience 2016 conference, harnessed data from over 2 million people who downloaded the game. Getting lost is one of the first symptoms of Alzheimer's disease. And the researchers at University College London believe the results could help make a dementia test. <br/><br/>Sea Hero Quest is a nautical adventure to save an old sailor's lost memories.