Some background:

I wanted to know what my digit span was and how I would score on the subtest. In a professional IQ test, they speak random digits at a rate of 1 per second and every time you recall them correctly, another random string of digits is spoken but this time with 1 more digit and this repeats until you fail twice. Most people score a digit span of 7, plus or minus 2. I tested myself with this app on my phone and I used to score around 13 at first, sometimes 14, because I have not been busy with numbers the last few months so I am rusty, the numbers werenât very clear and I couldnât feel them properly. However, now a couple of weeks later, without doing anything other than some small 2 by 2 or 3 by 3 multiplications once every few days just for fun like I always do, I can score around 15 digits, 16 digits is the highest Iâve done. The numbers are clearer now and I can feel them more and this could explain why I score much higher now but would this count on an IQ test?

I donât think this is the practice effect because the vividness and feelings of numbers changes all the time to me. Sometimes I have bad days where the numbers feel so distant and sometimes I have good days and the numbers are as clear and fluid as water without me doing anything. My mood also plays a significant role and my energy, if I am tired then of course I am going to perform worse like everyone else. I donât know if 13 is my digit span or 15/16 and I feel like I can even score higher if I try to. If a digit span of 14 correlates to someone with an IQ of 160 (160 is the ceiling for most professional IQ tests) then what the heck would a 16 digit span mean?

I checked if it was the practice effect, perhaps I got used to the voice I heard on the app or something so I changed the voice and accent, still english but it didnât change anything, I scored 15 again. 15 and especially 16 digits seems extremely high. I canât find anyone who scored 16 digits on the digit span subtest except people who used mnemonic devices and techniques. If I look at my calculating abilities and memory it makes sense for me to have a high digit span but I have noone to compare myself to with these high scores. To put this in perspective, Rudiger Gamm had a forward digit span of 11 and a backwards digit span of 12.

This guy! ^

I already scored 13/14 when I couldnât feel the numbers very well, now I score 15/16. I donât even see or repeat the numbers out loud, I just hear them and try to remember them in my head. I feel like I can go as far as 20 which would be crazy since 16 digits is already double the average and then some.