How good are you at doing two tasks at once?
First,
you will have to memorise numbers. Immediately after
each of the numbers to memorise, you will have to decide whether an
equation shown on the screen is correct or not.
Press the left
arrow key if the equation is correct.
Press the right arrow key if the
equation is wrong.
Try to be as accurate and as fast as
possible.
After this decision, the next number to memorise
follows.