Mark Waser wrote:
spatial perception cannot exist without vision.

How does someone who is blind from birth have spatial perception then?

Vision is one particular sense that can lead to a 3-dimensional model of the world (spatial perception) but there are others (touch & echo-location hearing to name two).

Why can't echo-location lead to spatial perception without vision? Why can't touch?

I think the main disagreement is the vagueness of the definitions and interpretations of visual and spatial.

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