Table 1.

Characteristics of bursting activity recorded extracellularly from heart interneurons in ganglia 3, 4, 6, and 7

Ganglia and neuron groupTreatment conditionPeriod (sec)Duty cycle (%)Spike frequency (Hz)Spikes/burst (n)Burst duration (sec)
3 and 4, oscillator interneuronsControl8.8  ± 2.056.5  ± 4.813.2  ± 2.764  ± 124.9  ± 1.0
(6.4–12.7)(50.3–66.8)(10.2–20.0)(49–91)(3.6–7.0)
Bicuculline6.5  ± 1.069.9  ± 2.79.3  ± 2.242  ± 104.5  ± 0.8
(4.8–8.6)(65.8–75.5)(6.6–14.7)(29–67)(3.2–6.0)
Washout7.1  ± 1.963.9  ± 3.211.6  ± 3.151  ± 134.5  ± 1.1
(4.8–11.0)(57.5–70.8)(7.5–18.9)(31–81)(3.1–6.9)
6 and 7, premotor interneuronsControl6.8  ± 1.160.9  ± 3.211.4  ± 2.248  ± 104.1  ± 0.7
(5.2–8.4)(56.9–68.5)(8.2–15.9)(31–68)(3.1–5.4)
Bicuculline6.6  ± 0.864.3  ± 2.511.1  ± 2.348  ± 134.2  ± 0.5
(5.3–7.9)(59.3–68.2)(8.4–15.9)(33–73)(3.5–5.1)
Washout6.4  ± 0.863.4  ± 2.511.0  ± 2.145  ± 84.1  ± 0.5
(4.9–7.9)(59.8–68.1)(9.0–16.9)(35–70)(3.3–5.0)
  • Data from ganglia were pooled according to the functional role of the neuron in the network, i.e., oscillator versus premotor interneurons. In a data cell, a mean value ± SD (above) and observed minimal and maximal values (below in parentheses) are presented.