It’s more like “fundamentally perceive the world in a different way”, and generally leads to a lack of empathy towards the other group due to this difference of perception.

This is one reason why, at least until recently, US generals were not known for their high IQ.

This should be:

… inability to empathize with…

Poor wording on my part.

No way to do that the other way around.

If your IQ is very high or very low, you likely have not spent a whole lot of time practicing things and pursuing things that typical people have. So the shared social language and thread of common experience that people depend upon to relate is limited.

Most humans cannot get better at this easily at least. You can always try...

On working memory, I think the average is 7, or something like that, Try to remember a number in inversed order and see if you get past that to 9-10 that´s pretty hard to learn too

I remember the day our class was asked about a dice. I was the only know that knew by observation the response to which number was under the dice not being visible.

PS They always add up to seven

YMMV

I had dice as a kid that did not follow this rule.

I now want to take a standardized IQ test, three times - once with sober, once mildly intoxicated by cannabis, and as intoxicated as possible while still being able to focus on the questions.

I'm very confident that the time it would take me to answer a given question would increase about linearly with my level of intoxication, but I'm not at all confident that I would arrive at a different conclusion.