Fig. 1.

Courtship behavior in grasshoppers and stimuli used. (A) During natural courtship behavior, male grasshoppers produce a calling song. Based on temporal features of this song, the female decides whether to respond with her own song to initiate further courtship. In playback experiments, songs were broadcast using a speaker and the female response was recorded by a microphone. (B) Songs used in playback experiments were sequences of attractive and nonattractive syllables (dark and light gray, respectively). Details of an attractive (black) and a nonattractive (gray) syllable are shown. (C) Three of the songs used in the playback experiments. The full stimulus set is shown in Fig. S1.