Hi Francisco, The Spatial Pooler is an artefact of NuPIC; it simulates the way a layer of columns becomes activated by feedforward inputs. In essence, the algorithm is:
Get all columns to check their feedforward dendrite and generate an activation score. Pick the top 2% of columns based on activation score and activate them. Update the permanences on the feedforward dendrites. In the neocortex, the columns do this themselves, and they pick the top 2% (may vary) by higher-score columns inhibiting nearby lower-score columns. They also update their own synapses themselves. So the SP is simulating the inter-region communication as well as the single-region sensory communication. Regards, Fergal Byrne
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