Parameters Used in the SSN Simulations
| Symbol | Figure 2 | Figure 3 | Figures 4, 5, 6, and 7 | Unit | Description |
|---|---|---|---|---|---|
| NE | 1 | 4,000 | 50 | – | Number of excitatory units |
| NI | 1 | 1,000 | 50 | – | Number of inhibitory units |
| τE | 20 | ms | Membrane time constant (E neurons) | ||
| τI | 10 | ms | Membrane time constant (I neurons) | ||
| Vrest | −70 | mV | Resting membrane potential | ||
| V0 | −70 | mV | Rectification threshold potential | ||
| k | 0.3 | mV−n ⋅ s−1 | Nonlinearity gain | ||
| n | 2 | – | Nonlinearity exponent | ||
| WEE | 1.25 | mV ⋅ s | E→E connection weight (or sum thereof) | ||
| WIE | 1.2 | mV ⋅ s | E→I connection weight (or sum thereof) | ||
| WEI | 0.65 | mV ⋅ s | I→E connection weight (or sum thereof) | ||
| WII | 0.5 | mV ⋅ s | I→I connection weight (or sum thereof) | ||
| τnoise | 50 | ms | Noise correlation time constant | ||
| σ0,E | 0.2 | 1 | mV | Noise standard deviation (E neurons) | |
| σ0,I | 0.1 | 0.5 | mV | Noise standard deviation (I neurons) | |
| pE | – | 0.1 | – | – | Outgoing connection probability (E neurons) |
| pI | – | 0.4 | – | – | Outgoing connection probability (I neurons) |
| τsyn | – | 2 | – | ms | Synaptic time constants |
| Δ | – | 0.5 | – | ms | Axonal delay |
| ℓsyn | – | 45 | deg. | Connectivity length scale | |
| ℓnoise | – | 60 | deg. | Noise correlation length scale | |
| ℓstim | – | 60 | deg. | Stimulus tuning length scale of the input | |
| b | – | 2 | mV | Input baseline | |
| Amax | – | 20 | mV | Maximum input modulation (100% contrast) | |
| θstim | – | 0 | deg. | Stimulus direction | |