Table 1

Parameter values

Number of excitatory units in each column40
Number of inhibitory units in each column40
Unit firing threshold5 mV
Conduction delay between cortical units3 ms
Conduction delay to motor outputs10 ms
External Input PSP strength350 μV
Unit potential time constants τs, τf3.2, 0.8 ms
External input rate1800 spikes/s
External input correlated spike percentage30%
External input correlated spike SD3 ms
Training factor r100
Weakening factor c0.55
STDP strengthening curve time constants as, af15.4, 2 ms
STDP weakening curve time constants bs, bf33.3, 2 ms
Conditioning stimulus intensity2 mV
Maximum connection strength (used to calculate wmax)500 μV
Minimum weight wmin1
Weight change squashing (weight dependence)0 (none)
Probability of excitatory cortical connections1/6
Probability of inhibitory connections1/3
Probability of corticomotoneuronal connections1/3
Number of motoneurons40
Motoneuron thresholds5–6 mV
Motor unit potential size0.5–1.5 mV
Available simulation time step sizes h0.1 (default), 0.05, 0.025, 0.02, 0.01 ms