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Fig. 8. Activity of slow exciters during immobile postures of the cricket. (A) Raw
data of activity of slow exciters when the cricket maintained the recorded
F–T joint at various angles during thanatosis or quiescent state. During
the quiescent state, at least one CI unit fired sporadically at low frequency
(0.5–2 Hz). (B) Average spike frequencies of slow exciters sampled for 5
s when the cricket exhibited strong thanatosis, weak thanatosis (see drawings)
or the quiescent state at various F–T joint angles were plotted
quantitatively. To count spikes of slow motor neurones, the window (threshold)
was set just above the noise level and below the CI spike amplitude. Activity
during ventilatory phases and those just after arousal from thanatosis were
excluded from sampling. Note that activity of slow exciters during thanatosis
is rather suppressed compared with those during the quiescent state at the
same F–T joint angle.
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