During a sleep experiment, I used to record my mental performance by a simple arithmetic game. Start with a 3 digit number, subtract 9, then 8, then 7...so on. Time yourself in the task. If the result is ±3 seconds to my average score, means I am quite active.
The problem is that with a systematic enough approach, verifying that you’ve memorized the working data at each step until you do, it’s possible to keep on going to 2^50 and beyond, losing all day on the activity :-)
During a sleep experiment, I used to record my mental performance by a simple arithmetic game. Start with a 3 digit number, subtract 9, then 8, then 7...so on. Time yourself in the task. If the result is ±3 seconds to my average score, means I am quite active.
That reminds me of “counting doubles” from Ender’s Game: 2, 4, 8, 16 … etc until you lose track.
The problem is that with a systematic enough approach, verifying that you’ve memorized the working data at each step until you do, it’s possible to keep on going to 2^50 and beyond, losing all day on the activity :-)