Fig. 3. Two examples of songs produced before, during, and after bead implantation showing changes in overall song structure and recovery of syllable morphology. Left panel, Song before implantation (a) was continuous, loud, and highly harmonic. Two weeks after bead insertion (b), some syllables (1 and 4) are muted, and others (5 and 6) have been silenced, leaving long gaps in the song. After bead removal (c), the song syllables have returned to very near their prebead structure, but the missing syllables have not returned, and the temporal structure of song has changed such that syllable 1 now follows syllable 4 with a normal intersyllable interval.Right side,a, Prebead song;b, song recorded 2 d before bead removal. The gap left by the deletion of syllable 5 has been almost completely elided. c, Song recorded 6 d after bead removal. Syllables 1, 3, and 4 have recovered the full spectral range of the prebead song, syllable 2 has ceased to appear as a click, and syllable 4 is no longer repeated. Scale bar and axes are identical to Figure2.