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Fig. 3. Effects of experimental treatments on rev displays. Within treatment pairs
(control and experimental), peak intensities were normalized to the maximum
intensity produced. Graphs show average dB differences for each treatment
type. (A) Palpal treatment. Experimental treatment attenuated high frequencies
(**P<0.001, paired t-test). No significant difference was
observed for low frequencies (ns, not significant). (B) Abdominal treatment.
Experimental treatment attenuated low frequencies (*P<0.05, paired
t-test). No significant difference was observed for high frequencies
(ns). (C) Palpal and abdominal treatment. Experimental treatment attenuated
both low and high frequencies (**P<0.001, paired
t-test).