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Overall song features
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| size of song type repertoire |
number of different song types in the repertoire of a subject |
| size of syllable type repertoire |
number of different syllable types in the repertoire of a subject |
| % repeated syllables |
number of syllables that occur two or more times in a row divided by the total number of syllables |
| song duration (ms) |
song duration measured from the onset of the first syllable after the introductory syllables to the offset of the last syllable as delineated in SAP |
| number of syllables per song |
number of syllables per song not taken into account introductory syllables |
| tempo (s−1) |
number of syllables per seconds within a song |
| increment of pitch (Hz/ms) |
difference in pitch from first to last syllable within a song divided by song duration |
| correlation pitch/sequential order |
correlation coefficient between mean pitch of a syllable and its sequential order in the song, describes the change of pitch |
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Spectro-temporal features (SAP)
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| syllable duration (ms) |
time elapsing from the onset to the offset of a syllable |
| mean pitch (Hz) |
for harmonic sounds: fundamental frequency; otherwise: mean frequency |
| mean frequency modulation |
estimate of absolute slope of frequency traces |
| mean entropy |
width and uniformity of power spectrum, measure of noisiness |
| mean pitch goodness |
periodicity or harmonicity of the sound |
| mean mean frequency (Hz) |
estimate of the centre of derivative power |
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Spectro-temporal stereotypy
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| min cv syllable duration |
minimum coefficient of variation of duration |
| min cv mean pitch |
minimum coefficient of variation of pitch |
| min cv mean frequency modulation |
minimum coefficient of variation of frequency modulation |
| min cv mean entropy |
minimum coefficient of variation of entropy |
| min cv mean pitch goodness |
minimum coefficient of variation of pitch goodness |
| min cv mean mean frequency |
minimum coefficient of variation of mean frequency |
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Sequential stereotypy
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| internal linearity score |
sequential order of syllables in the song (see text) |
| consistency score |
probability of consistent syllable transitions (see text) |
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Performance related song features
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| number of songs |
total number of songs in 1 h of separation (first trial) |
| latency to sing (s) |
latency to sing after separation from mate (first trial) |
