How would you know if it works?

My plan is to watch for apparent increases in concentration level and reductions in willpower expenditure. The trick is differentiating that from ordinary habit and skill formation effects.

Past experience [for what it's worth] leads me to believe the effects tend to kick in when I stop using a given message rather than while it is flashing. My explanation for that is that the brain becomes accustomed to the stimulus and starts generating it on its own, which somehow triggers internalization of the associated behavior.