4 4 fru ILfr . icifizZem iftnnriaant _r_inval Fig. 15.4: Small-scale portrayal of a portion of the spatiotemporal hierarchy in Jeff Hawkins' Hierarchical Temporal Memory architecture. 15.3.3 Dual Networks Finally, if both hierarchical and heterarchical structures exist in an Atomspace, then both ECAN and PLN will n