Figure 3

Two−dimensional characterization of female calling song propagation. (a) Schematic representation of a recording set-up with two laser vibrometers per stalk positioned perpendicularly to each other (red). Inset illustrates how true amplitude (A _true ) at each position on the stalks was calculated from amplitude information (Y _t ) and (X _t ) from two perpendicularly aligned laser vibrometers. Stimuli 100 Hz, 150 Hz or pre-recorded FCS were applied to the leaf at different positions (midpoint, side, base and apex) and symbols (a) match the symbols in (b,c,d). (b,c,d) Time differences (Δt) and calculated true RMS amplitude difference (ΔA _true ) of vibrational signals simultaneously recorded at positions “ipsi” and “contra” when different stimuli were used. Values below 0 indicate signals in which true amplitude was higher on the contralateral stalk. For more detailed information, see text.