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Copying and Evolution of Neuronal Topology

Figure 3

William Calvin proposes a hexagonal replicator on a single 2D surface layer of cortex.

Each cell is a superficial pyramidal cell that has standard length collaterals that project in a circle of radius 0.5 mm. If two such neurons have the same receptive field properties and are separated by 1 mm, e.g. A and A, then these collaterals overlap at two points A′ and A′. The two neurons at A′ will receive superimposed correlated firing from the A neurons and will therefore ‘copy’ the firing pattern of the A neurons. Neurons displaced from A within the same triangle, e.g. B and B, will make similar copies, B′ and B′. However, this explanation does not explain how A's connections to B will be copied between A′ and B′, i.e. how ‘p-bonds’ are formed.

Figure 3