I am generally familiar with the concept of tapping from my failed attempts at playing guitar. I understand the general concept of using your plucking hand to articulate a note by touching the fingerboard—usually towards the bridge and followed by a pull off and hammer on with the fretting hand a few notes down.–ala the Eruption solo.
However, I have seen several bassists (including Josh) do a “reverse tap” where a note near the bridge is plucked as normal, but then the bassist uses their plucking hand to “reach around” and articulate a note on the fingerboard near the nut. I am curious as to 1) what this technique is called; 2) what it accomplishes that you could not otherwise by just moving your fretting hand down; and 3) when to utilize it.