Table 1.
Full set of parameters.
| Description | Name | Unit | Mean μ | σ/μ | π/μ | Comment |
|---|---|---|---|---|---|---|
| NETWORK ARCHITECTURE | ||||||
| Number of exc neurons | Ne | 144 | ||||
| Number of inh neurons | Ni | 48 | ||||
| Conn prob from exc to exc neurons | pee | 0.1 | ||||
| Conn prob from exc to inh neurons | pie | 0.2 | ||||
| Conn prob from inh to exc neurons | pei | 0.3 | ||||
| Conn prob from inh to inh neurons | pii | 0.6 | ||||
| NEURONS (EXCITATORY AND INHIBITORY) | ||||||
| Membrane capacitance | Cm | nF | 0.2 | 0 | 0 | by definition |
| Leakage reversal potential | Vrest | mV | −63,…,−55 | variable parameter | ||
| Firing threshold voltage | Vthresh | mV | −55.0 | 0.05 | 0.1 | |
| Reset potential | Vreset | mV | −80.0 | 0.1 | 0.2 | |
| Excitatory reversal potential | Ee | mV | 0.0 | 0 | 0 | −20 mV in some simulations |
| Inhibitory reversal potential | Ei | mV | −80.0 | 0 | 0 | |
| Leakage conductance | gleak | nS | 40.0 | 0.5 | 0.5 | *) |
| Refractory period | τref | ms | 1.0 | 0.5 | 0.5 | |
| RECURRENT SYNAPSES | ||||||
| Weight of exc to exc synapses | wee | nS | 1.03 | 0.6 | 0.7 | *) values refer to |
| Weight of exc to inh synapses | wie | nS | 0.52 | 0.6 | 0.7 | *) static synapses |
| Weight of inh to exc synapses | wei | nS | 3.10 | 0.6 | 0.7 | *) |
| Weight of inh to inh synapses | wii | nS | 1.55 | 0.6 | 0.7 | *) |
| Cond time constant for all synapses | τsyn | ms | 30.0 | 0.25 | 0.5 | |
| Conversion factor for facilitation | 1.10 | to match with static syns | ||||
| Conversion factor for depression | 1.65 | at regular firing of 20 Hz | ||||
| Strength of STP | λ | 0.78 | 0.1 | 0.2 | ||
| Bias for facilitation | β | 0.83 | 0.1 | 0.2 | ||
| STP decay time constant | τSTP | ms | 480 | 0.2 | 0.4 | |
| Step per spike for facilitation | Cfac | 0.27 | 0.1 | 0.2 | ||
| Step per spike for depression | Cdep | 0.11 | 0.1 | 0.2 | ||
| EXTERNAL STIMULUS: POISSON SPIKE TRAINS | ||||||
| Number of exc external spike sources | Next,e | 32 | ||||
| Number of inh external spike sources | Next,i | 32 | ||||
| Number of exc inputs per neuron | 4–6 | uniform distribution | ||||
| Number of inh inputs per neuron | 4–6 | uniform distribution | ||||
| Firing rate per input spike train | νinp | Hz | 11.8 | 0.2 | 0.2 | *) |
| Weight of exc input synapses | winp,e | nS | 0.26,…,1.29 | 0.6 | 0.7 | *) varied via Winput and |
| Weight of inh input synapses | winp,i | nS | 0.77,…,3.87 | 0.6 | 0.7 | *) refer to Vrest = −60 mV |
| Cond time constant for all synapses | τsyn | ms | 30.0 | 0.25 | 0.5 | |
| EXPERIMENT | ||||||
| Simulated time per exp run | Texp | ms | 4500 | only t ≥ 1000 ms evaluated | ||
| Number of exp runs per param set | nrun | 20 | ×64 in hardware with same network | |||
All values given in biological units. If not stated otherwise, values are drawn from a bound normal distribution with mean μ, standard deviation σ, and bound π. Parameters marked by a *) have been spread for the hardware emulations by configuration.