I think this is a bad test because I lost focus half way through and still scored 100%. The first few were tricky, because you're not yet "wired" to only see th

I think this is a bad test because I lost focus half way through and still scored 100%. The first few were tricky, because you're not yet "wired" to only see the red ones. Then it gets easy, and after 10 or so you get bored. This is when you should be making mistakes. Unfortunately, humans have extraordinary peripheral vision so even if you do tasks that destroy your concentration (in my case: selecting some tracks on spotify and reading the subject of a "new email bubble") you will still be able to sense whether the red bars rotated. To really test concentration you should have some kind of continuous stream of information, so that you lose count the moment your mind drifts. That would probably give much better data. Then you can measure the average time before people lose concentration, and so forth.