In all seriousness (but with less fun), a similar effect can be produced simply by asking them to be reciting the alphabet constantly, solving addition problems constantly being fed to them, etc. -- anything that is constantly distracting half their brain.
In fact, this is a similar technique some actors use to make sure they know their lines cold -- no matter how well they can recite them with full concentration, can they still recite them while playing an intense video game? Because things will be so different on stage/set, it will be equivalently distracting.
In fact, this is a similar technique some actors use to make sure they know their lines cold -- no matter how well they can recite them with full concentration, can they still recite them while playing an intense video game? Because things will be so different on stage/set, it will be equivalently distracting.