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Robustness of signal recognition measured in behavioral tests with degraded female songs. a Phonotaxis responses of seven male grasshoppers. Abscissa: degradation levels in dB; ‘n’ indicates pure noise. Ordinate: the percentage of phonotactic turning responses; 100% means that the male reacted to every stimulus presentation. Behavioral critical degradation levels (bCDL) were determined at the intersection of each curve with the 50% response level (see arrow). b bCDL of 59 animals
