Table 1.

Synaptic connections between HVC_(RA) neurons and interneurons

Connection tested	Incidence	Synaptic strength (pA)	Delay time (ms)
HVC(RA) → INT (E, m)	34/43	135.6 ± 155.8	0.43 ± 0.16
INT → HVC(RA) (I, m)	28/42	31.8 ± 28.0	0.37 ± 0.10
HVC(RA) → HVC(RA) (E, m)	1/140	22.8	1.01
HVC(RA) → HVC(RA) (I, d)	78/140	25.2 ± 23.8	1.85 ± 0.30

Values for incidence, average synaptic strength measured in voltage clamp, and delay times are shown for all paired recordings. The type of connection is shown on the right in the first column: E, Excitatory; I, inhibitory; m, monosynaptic; d, disynaptic.