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1. Formant

   Linked via "tongue blade tension"

   Influence of Tongue Height on $F1$
   The first formant ($F1$) is inversely related to the height of the tongue body in the mouth. Higher tongue positions create a smaller pharyngeal cavity relative to the oral cavity, which effectively lengthens the acoustic path, thus lowering the resonant frequency of $F1$ [2]. In extreme cases of extremely high vowels, such as /i/, the tongue blade tension can be so high that $F1$…