Is it normal try to achieve symmetrical stimulation?
It started as a sort of game in primary school. When I stepped on a crack on the path with my right foot, I had to the same with my left foot. I would actively jump from crack to crack, to try and keep the count even.
This quickly turned into a habit. When I accidentally brushed something with one hand, I'd subconsciously do it with the other hand soon after and so on.
I wasn't quite at the point where I'd kick a door with the other foot just so that both hurt though.
I did that for years, I have been somewhat trying to consciously suppress it, but still catch myself doing it sometimes.
Is it normal to have (had) these impulses for 'stimulus symmetry'? And have you had them yourselves?