According to a parallel distributed processing (PDP) model, how is the fact "Alex Rodriguez was a shortstop" represented in the mind?
1) Two nodes, one representing Alex Rodriguez and one representing shortstop, are in proximity to one another.
2) Patterns of connections among many nodes separately represent Alex Rodriguez and shortstop, and through learning these patterns have become linked to each other.
3) A single node representing Alex Rodriguez is connected via a proposition to the word "shortstop".
4) Two neurons, one representing Alex Rodriguez and one representing shortstop, are connected via a synaptic junction.
