TABLE 1.
Strengths and numbers of synapses in brain stem feedback model
| Synapse | Type | Maximal Conductance, mS/cm2 | Number of Synapses |
|---|---|---|---|
| HVCRA → HVCRA within cluster | E | 1.0 | 1 per HVCRA neuron |
| HVCRA → HVCRA between clusters | E | 0.5 | 1 per cluster (except last cluster) |
| HVCRA → HVCI | E | 0.1 | 100 per HVCI neuron |
| HVCI → HVCRA | I | 3.0 | 100 per HVCI neuron |
| HVCRA → dRADM | E | 0.004 | 1,170 per syllable* |
| HVCRA → dRARAm | E | 0.3 | Variable (see text) |
| HVCRA → vRAnXIIts | E | 0.3 | Variable (see text) |
| dRADM/PAm → DM/PAm | E | 0.075 | 5 per dRADM neuron |
| DM/PAm → Uva | E | 0.075 | 5 per DM neuron |
| Uva → HVCRA | E | 0.04 | 3 per Uva neuron |
| Uva → HVCI | E | 0.0125 | 5 per Uva neuron |
| dRARAm → RAm | E | 0.02 | 15 per dRARAm neuron |
| vRAnXIIts → nXIIts | E | 0.02 | 15 per vRAnXIIts neuron |
E, excitatory; I, inhibitory.
*
Here, 150 synapses per syllable with a maximal conductance of 0.03 mS/cm2, and other combinations, produce indistinguishable model spike patterns.