Ah, well, I tend towards an embodied cognition point of view.

   I get there because humans are social creatures - so natural
   we're doing it even now, across the wires of the Internet.

   Our nervous systems extend towards and incorporate that which we
   bring "in" and extend out "to".

   I get there because babies not socialized through care *die*,
   even though fed/watered/changed. [famous sad case of 1930s
   German nursery if memory serves where the babies who were
   mechanically cared for died, but those who were nurtured lived].

   No socialization = death for humans.

   I mention socialization as it covers a lot of sensory inputs all
   at once. Look at how young children socialize with inanimate
   objects, babbling to a ball and such. Doesn't matter if the ball
   doesn't talk back. It doesn't have to for socialization to take
   place.