This is one of the memory exercises that has a direct and quick impact on your working memory. So take it seriously and if you would find it hard to follow do not give up; just try to learn and do!
You will see four squares appear in 3*3 boxes as in the following. Scroll down by your LEFT hand to see the next box if the pattern of the squares is the same as it was one trial back; i.e., the same pattern appears twice in a row. And scroll down by your RIGHT hand to see the next box if the pattern of the squares is different from the previous one.
During the exercise do not look at the previous boxes, just focus on the current one.
If scrolling by mouse by left or right hand is difficult for you then use the down arrow key; one hand by the mouse and one hand by the down arrow key.
If you are using a device different from a PC or notebook then choose a key or tool of your device for left hand's function and one key or tool for right hand's function, or use the same key but by switching hands on it.
You should not take more than 2 seconds for each box. If not possible for you try it and try until you would be able to do that in 2 second periods for each box.
If you do not know if you are doing well and fast enough then ask someone to supervise you during the first tries.
NOTE: You should do this exercise 5 days in a row to obtain its benefit for your brain; each day at least 16 minutes. The more the better. For the sake of your brain, do not be lazy to this exercise.
Ready? Start:
GOOD JOB! Try again!