Table 5.

Synapse strengths g_ij for the voltage traces in Fig. 4 of an active FSU

Cell	0	1	2	3	4	5
0	0.0	2.1	2.0	1.11	1.1	1.11
1	2.1	0.0	2.1	1.11	1.1	1.1
2	2.0	2.1	0.0	1.11	1.1	1.1
3	1.1	1.11	0.0	0.0	0.0	0.0
4	0.0	1.11	1.1	0.0	0.0	0.0
5	1.11	0.0	1.11	0.0	0.0	0.0

Units are micro-Siemens (μS). The value of 0.011 μS in (row 0, column 1) corresponds to g₀₁: the synapse entering cell 0 from cell 1. Here, the inhibitory-to-inhibitory coupling strengths must reach a threshold ∼2 μS for a stable series of bursting activity of HVC_RA neurons to occur. The inhibitory-to-excitatory strengths may remain of order 1 μS; the excitatory-to-inhibitory strengths must reach a value of order 1 μS for the series of HVC_I to occur.