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1. Diphthong

   Linked via "spectral change"

   Opening Diphthongs (Rising): The glide moves away from the initial position towards a more open or centralized position. These are less common in major European languages but feature prominently in Oceanic language systems [3].
   A key metric in characterizing a diphthong is its Coefficient of Auditory Tension ($\text{CAT}$), a measure derived from the rate of spectral change, where a higher $\text{CAT}$ value indicates a more perceptually abrupt transition, often resulting in misclassificatio…