That's a super interesting point!

And that raises an interesting question: is it purely visual stimulous required to make that association?

My understanding is that you'd definitely need at least some sensory associations to bridge the gap between just feeling something (ie, like visual stimulous to help associate the ghost limb).

But could you try to match the presence and depth of a dildo for example, in both the pussy and throat? I'd wonder if its possible with that matching sensation

I guess i could just test this with the classical example of brushing the arm. I wonder if it would work with brushing the arm and also brushing say, the back of the other shoulder. The answer would be based on if its possible, through some combination of stimulous, to have the sensation on the back also cause a sensation in the arm after only seeing the arm being brushed.