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Re:Aphantasia by FPGAhacker on Saturday November 27, 2021 @09:40PM (#29365712)
I’m not doubting your friend, but that kind of mental visualization ability (doing arithmetic on visualized paper) has to be extremely rare. That is savant level capability. I would say that ability depends much more on short term memory capacity than anything else. I think the visualization aspect is incidental.
Re:Aphantasia by light_hue_1 on Saturday November 27, 2021 @10:05PM (#29365820)
> but that kind of mental visualization ability (doing arithmetic on visualized paper) has to be extremely rare. That is savant level capability

No way. I would say most of the math students I've taught at the university level could do it to some extent.

It's not all that helpful. The problem is that your visual scratch pad is quite limited. If you're forced to always rely on it you won't get far without having to unlearn bad habits.

This happens to people with amazing memories too. I can't name a single colleague at my top 10 university that has an eidetic memory. The people I've met with amazing memories have systematically had a lot of issues because of their memory. It's too easy to rely on remembering things and then you never build good heuristics and don't generalize well.

Re:Aphantasia by robbiep on Saturday November 27, 2021 @11:44PM (#29366220)
It is pretty handy in a related concept - rotating stereoisomers in organic chemistry
Re:Aphantasia by ok_dad on Sunday November 28, 2021 @12:14AM (#29366365)
I can definitely see things in great detail in my mind, I don't feel like it's too hard, is it really that uncommon?

My wife always loses things, and when she is looking I just virtually walk around my house to figure out where it is. I'm not sure I see every detail, but I see most of the home. Same for if I am talking about where something is for driving, I just virtually drive there in my head and explain the major turns to them as I go. I can also picture math and programming in my head; the former usually as geometric shapes forming to solve a problem and the latter as flow charts.

I'm not the smartest person, so I'm pretty sure it's just practice that allows me to do this, as I've always been a sort of loner and had to picture books and worlds in my head to entertain myself.

Re:Aphantasia by bobsmooth on Saturday November 27, 2021 @09:44PM (#29365734)
I visualize mental math but anything more than 2 digits by 2 digits is hard to keep track of. Short term memory is very much the limiting factor.
Re:Aphantasia by aappleby on Saturday November 27, 2021 @09:56PM (#29365792)
Surely it isn't that rare? I can track about 8 digits total while doing mental mul/div, and I don't think of that as anything special.
Re:Aphantasia by the_only_law on Saturday November 27, 2021 @10:00PM (#29365801)
I’m probably just an idiot, but I am absolutely terrible and anything that requires me to retain information in my head for a calculation.
Re:Aphantasia by FPGAhacker on Saturday November 27, 2021 @10:06PM (#29365828)
So you could multiply or divide two four digit numbers by visualizing them?

To me that is pretty incredible!

Re:Aphantasia by josephcsible on Saturday November 27, 2021 @10:17PM (#29365882)
How do you figure? Just the two inputs would take up all 8 digits, but you need to keep track of a bunch of intermediate results too.
Re:Aphantasia by aappleby on Saturday November 27, 2021 @11:55PM (#29366280)
Yeah 4x4 would be a bit much, 3x3 is doable, 3x2 is easy.
Re:Aphantasia by godDLL on Saturday November 27, 2021 @11:14PM (#29366110)
A few years back I couldn't visualize a point.

Recently I learned to read words backwards in my mind.

It's a skill.