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Fig. 2. Intensity function of phonotactic behaviour. (A) Phonotactic orientation of
a cricket towards an optimal sound pattern presented from the left and right
for 30 s at increasing intensities from 45 to 85 dB SPL. For each sound
intensity the lateral deviation (top) is plotted over time. At the start of
each trial the lateral deviation is reset to zero. The lateral steering
velocity (middle) oscillated around zero at low sound intensities. At high
sound intensities oscillations in the velocity signal were still evident, but
the signal was shifted towards the side of acoustic stimulation. The
translation velocity (lower trace) exhibited a broad variation in amplitude
due to the temporal resolution of individual velocity peaks underlying
walking. (B) Intensity dependence of the behaviour. With sound intensity
increasing from 45 to 75 dB SPL the overall lateral deviation from a straight
line increased 6.1-fold. The overall path length walked increased 1.7-fold
with increasing sound intensity as calculated for the 60 s trial.
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