Table 2.

Number of nonlinear phenomena, two-voice phenomena and harmonic vocalizations present in the vocal repertoires of the mockingbirds in this studya

(A) Unilateral flow classification categoriesc
Bird IDRepertoire sizeb1f0FJSHCHBP
m108121171843412
m123602581210516
m130731661518831
m152102309131821113
Mean ± s.d.89±27.63226±69.6212±2.9412.5±6.8117±13.2943±47.38
(B) Bilateral flow classification categoriesd
Bird ID1f0FJSHCHSB-2VC2SB-fixed2SB-changing2VC
m10838333029282664566
m123230945351321536
m13006875599611338666
m1521365101324062297
Mean ± s.d.13.3±17.4649±20.2831±30.8966.25±45.5149.75±31.2239.5±49.7031.25±26.32516.25±156.38
  • a Number of individual syllables assigned to each classification category (N=1000 syllables per bird). If a syllable contained more than one type of NLP it was counted toward totals of each, but if it contained at least one type, it was not included in `harmonic' categories (1f0 and 2VC) regardless of the ratio of harmonic vs nonlinear elements

  • b Total number of discrete syllable types within the 1000 syllable sample per bird

  • c Syllables produced with flow through only one side of the syrinx. 1f0, single f0 sounds; FJ, frequency jumps; SH, subharmonics; CH, deterministic chaos; BP, biphonation (two independent fundamental frequencies, but air flow through only one side of the syrinx)

  • d Syllables produced with flow through both sides of the syrinx during the portion of the sound containing the NLP. SB-2VC, sidebands (single carrier frequency with sidebands, but flow through both sides of the syrinx); since there was flow through both sides of the syrinx during these sounds, we did not classify them as NLP; 2SB-fixed, two f0, each with sidebands with a constant modulation frequency (parallel to f0); 2SB-changing, two f0, each with sidebands with a changing modulation frequency (not parallel to f0); 2VC, two-voice phenomena (each side of the syrinx producing a distinct, unrelated f0)