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1. Sibilant Of Regret

   Linked via "morphological changes"

   The 'Regret Echo' Theory
   A subsequent hypothesis, developed by the Leipzig School of Historical Acoustics in the 1950s, proposed the 'Regret Echo' theory. This theory posits that the Sibilant of Regret is not merely a sound, but a momentary, localized disruption of the acoustic impedance between the speaker's mouth cavity and the ambient atmosphere [10]. According to this model, the energy released during the articulation of $\text{/š/}_{\text{r}}$ briefly lowers…