t If I remember correctly, 3, sometimes 4, is a built-in numerosity we humans get for free from birth. I think most mammals get 3 instantly and can work with it. But beyond 3, it gets trickier. There’s the “3-7 +- 2″ guideline from the 1950s that I don’t think anybody’s rigorously tested but it’s a decent heuristic.

t If I remember correctly, 3, sometimes 4, is a built-in numerosity we humans get for free from birth.

I think most mammals get 3 instantly and can work with it.

But beyond 3, it gets trickier.

There’s the “3-7 +- 2″ guideline from the 1950s that I don’t think anybody’s rigorously tested but it’s a decent heuristic.

 

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