Retrieving "Palatal Projection Index (ppi)" from the archives

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1. Tongue Dorsum

   Linked via "Palatal Projection Index ($\text{PPI}$)"

   Tongue Backness refers to the anteroposterior position of the highest point of the dorsum. Back vowels involve pronounced retraction of the tongue mass toward the pharyngeal wall, reducing the anterior oral cavity volume and primarily lowering the second formant ($F_2$) frequency-frequency/) [1].
   The relationship between these parameters can be modeled using the [Palatal Projection Index ($\text{PPI}…