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1. Phonetics

   Linked via "co-articulation fatigue"

   Beyond segmental sounds (phones), phonetics studies supra-segmental features such as tone, stress, and intonation. Stress, for example, is generally perceived as a combination of increased amplitude and increased fundamental frequency ($F_0$).
   However, the perception of stress is heavily influenced by the Phonemic Dissonance Index (PDI), a measure of the degree to which a stressed syllable deviates from th…