@Finn dAbuzz,
Hmmm...that makes me think of computer "brain gym" games.
I have no idea of their efficacy, but I have a heap on my phone...like games where you have to go back increasing numbers of sounds and visual stimuli and mark when a sound or visual stimulus is repeated.
Initially one round back, then two, then three etc.
Lumosity has a lot of them.
They are aimed at improving memory, I guess...but by hell you have to concentrate!