Adjacency Graphs from PPNodes 139 26.6.4 Clustering in the Adjacency Graph 140 26.6.5 Discussion 140 26.7 Interfacing the Atomspace with a Deep Learning Based Perception-Action Hierarchy 140 26.7.1 Hierarchical Perception Action Networks 141 26.7.2 Declarative Memory 142 26.7.3 Sensory Memory 142 26.7.4 Procedu