"Our polynemes and micronemes grow into great branching networks that reach every level of every agency." This is an approximate hierarchy, but there are lots of messy cross-connections too.
Minsky alludes to a spiral of activity where a B-brain could choose the level of agents that are most active (i.e., focus on small details when things are going well, but move back when things are going poorly).
(NB: If there are many recurrent connections in the system, then the system could not be described as hierarchical!)
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