Retrieving "Extinct Prehistoric Languages" from the archives

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1. Front Vowels

   Linked via "extinct prehistoric languages"

   Where $c$ is the speed of sound, $L$ is the length of the anterior oral cavity, $k$ is an empirically derived constant accounting for the shape of the palate, and $\Delta\phi$ is the "Palatal Affective Modifier," a value hypothesized to reflect the speaker's emotional state regarding the preceding consonant cluster [6]. High $F_2$ values are thus generated by minimizing $L$.
   Crucially, studies on speakers of [extinct preh…