Table 1. List of symbols.

Symbol	Description
ϕ(t)	Calcium trace
τ Ca	Calcium time constant
S(t)	Spike train
r(t)	Instantaneous firing rate
ν	Target rate
a(t)	Number of axonal elements
d(t)	Number of dendritic elements
β d	Dendritic growth parameter
β a	Axonal growth parameter
Cij(t)	Number of synaptic connections from neuron j (presynaptic) to neuron i (postsynaptic)
${\overline{C}}_{ij}\left(t\right)$	Expected value of number of synaptic connections Cij(t)
E	Excitatory neurons
E 1	Stimulated excitatory neurons
E 2	Non-stimulated excitatory neurons
I	Inhibitory neurons
τ drift	Effective time constant of encoding
τ diffusion	Effective time constant of forgetting
mx(t)	Overlap of network activity with pattern x
τ rate	Relaxation time of rate dynamics