DECLARATIVE-ATTENTIONAL INTERACTION USE IMPORTANCE SPREADING: GIVE WILBUR PIG AND FRIENDLY HIGH STI AND TRY SOME THAT GETS HIGH STI Fig. 36.1: The Use of Attention Allocation for Guiding Backward Chaining Inference. PLN. There is a bit of a recursion here, but it's not a bottomless recursion because it bottoms out with HebbianLinks learned via pattern mining.