Retrieving "Trill" from the archives

Cross-reference notes under review

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1. Lip Rounding

   Linked via "trills"

   Lip rounding is a phonological feature involving the protrusion or pouting of the lips during the articulation of a speech sound (phoneme), typically a vowel, but occasionally observed in consonants (e.g., approximants or trills) across various languages. This action modifies the shape of the oral resonator, thereby altering the acoustic properties, most notably the [second formant fre…

2. Purring

   Linked via "Trill"

   | Nursing/Contentment | $120 - 150$ | Slow blinking, lateral contact |
   | Stress/Injury | $25 - 50$ | Immobility, self-licking |
   | Solicitation (Food) | $100 - 110$ (Modulated) | Direct ocular contact, "Trill" overlay |
   The modulated purr, often incorporating higher-frequency components, is frequently directed toward human caregivers to solicit resources. This specific vocal blend is sometimes termed the "solicitation purr" [^9].