Cell assembly size and computational performance are correlated. (A) Input-driven formation of cell assemblies brought about by the interaction long-term potentiation (LTP) and synaptic scaling (Syn. Sca.). (B) With more learning trials the assembly grows and integrates more neurons. We measure this by arbitrarily defining assembly size by that set of neurons connected with efficacies larger than half the maximum weights. (C) Parallel to the outgrowth of the cell assembly the error of the system to perform several linear and non-linear calculations decreases.