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Fig. 6. Action potential (AP) distribution in responses to stimulation with 10
µg bombykal. Post-stimulus-time histograms (binwidth= 10 ms) for recordings
from ZT 1-4 for the beginning (A; 0-20 min), middle (B; 80-100 min), and end
of the recordings (C; 160-180 min). In the control recordings (left) the
numbers of APs in the first part of the phasic response decreased. Also, the
number of APs over the first 100 ms of the responses (insert in C) showed a
slight but significant decline at the end of the recording duration. Under the
influence of 8bcGMP (right) no changes are recognizable. Values in inserts are
means + s.e.m. Since the sample sizes differed for the different time windows
all y-axes were scaled to y=nx2 (dotted
line=100 ms after the onset of the sensillar potential). Different lower case
letters denote significant differences between tested groups of means
(separated by dotted lines in the insert) (ANOVA and Tukey HSD
post-hoc test; 
=0.01, P<0.01).
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