Table 1.
Stimulation parameters
| Parameter | Value | Description and unit |
|---|---|---|
 | 2 | Spontaneous activity of sDA neurons (spikes/sec) |
 | 30 | Delay activity (constant during ISI) (spikes/sec) |
 | 70 | Visual response of sDA neurons (spikes/sec) |
 | 11 | Activity of background neurons (spikes/sec) |
 | 14 | Visual response of background neurons (spikes/sec) |
| c | 0.1 | Connectivity (probability of synaptic contact) |
| NsDA | 1000 | Number of sustained delay activity neurons |
| NEx | 1000 | Number of excitatory (“expectation”) neurons |
| NInh | 1000 | Number of inhibitory neurons |
| NBG | 10000 | Number of background neurons |
| JEx,BG | 0.082 | Synaptic strength BG → Ex (mV) |
| JEx,sDA | 0.05 | Synaptic strength sDA → Ex (mV) |
| JEx,Ex | 0.01 | Synaptic strength Ex → Ex (mV) |
| JEx,Inh | -0.1 | Synaptic strength Inh → Ex (mV) |
| JInh,BG | 0.08 | Synaptic strength BG → Inh (mV) |
| JInh,sDA | 0.6 | Synaptic strength sDA → Inh (mV) |
| JInh,Inh | -0.2 | Synaptic strength Inh → Inh (mV) |
| τrec | 200 | Recovery-from-adaptation time constant (msec) |
| τnet | 10 | Network time constant (msec) |
 | 22 | Adaptation threshold (mV) |
| Qa | 100 | Adaptation constant (sec mV) |
| r | 0.001 | Learning rate (mV) |
| Θpre | 10 | Presynaptic learning threshold (spikes/sec) |
| Θpost | 12 | Postsynaptic LTP/LTD threshold (spikes/sec) |
| τm | 20 | Membrane time constant, all neurons (msec) |
| VΘ | 20 | Spike emission threshold, all neurons (mV) |
 | 15 | Reset potential Ex neurons (mV) |
 | 0 | Reset potential Inh neurons (mV) |
 | 5 | Refractory period Ex neurons (msec) |
 | 20 | Refractory period Inh neurons (msec) |