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Figure 1


Fig. 1. (A) Optomotor device and male túngara with inflated vocal sac. (B) Optomotor stimuli and illumination spectra. Túngara-specific optomotor stripe reflectance: representative male inflated vocal sac spectral reflectance (solid line) and inflated vocal sac imitation stripes (spectral filters: Lee 185 + GamColor 305 + GamColor 1516 above white construction paper; broken line). Moonlight irradiance measurements (filled circles) in air and under clear skies [recreated from figure 4C in McFarland (McFarland, 1991)], and spectral irradiance measurements of our optomotor moonlight mimic illumination (open circles; Dolan-Jenner + Lee 138 filter). Both spectra were normalized to the flux at 600 nm. (C) Optomotor illumination intensities for each of the six trial settings.





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