Animation of the PTM mode response showing the tympanum oscillated with a fundamental drum mode across frequencies from Coupled membranes: A mechanism of frequency filtering and transmission in the field cricket ear evidenced by micro-computed tomography, laser Doppler vibrometry, and finite element analysis

Animation S5. Animation of two representative posterior tympana, first from G. bimaculatus then T. commodus. The animation shows the movement of the tympanum at the frequency positions of the recorded vibrational optima (see figure 3 in article). At both peak one and peak two the tympanum oscillated with the same (0,1) drum mode, meaning only one of them can be the natural resonance of the membrane. The animations correspond to laser Doppler vibrometry (LDV) velocity recordings taken from each scan point of a mesh of scan points across the tympanal surface. [Latham B, Reid A, Jackson-Camargo JC, Williams JA, Windmill JFC. Coupled membranes: A mechanism of frequency filtering and transmission in the field cricket ear evidenced by micro-computed tomography, laser Doppler vibrometry, and finite element analysis. J. R. Soc. Interface.]