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Fig. 2. Eardrum vibration velocity spectra (amplitude, dB) for the four species
studied: Mabuya (A), Leiolepis (B), Ctenosaura (C)
and Gekko (D). The spectra are normalized by division by the sound
spectra measured at the eardrum. Thick line: ipsilateral stimulation, broken
line: contralateral stimulation. Values are in dB re 1 mm s-1
Pa-1, i.e. 0 dB corresponds to a vibration velocity of 1 mm
s-1 at 1 Pa (94 dB SPL).