Retrieving "Bilabial Stops" from the archives

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1. Labial Closure

   Linked via "bilabial stop"

   Closure Timing and Vowel Influence
   The duration required to establish complete labial closure is inversely proportional to the spectral bandwidth of the preceding vowel. Vowels with a narrower acoustic space (e.g., high front vowels) demand faster closure times, as the mouth cavity needs to transition rapidly from a constricted shape to a closed configuration. This relationship is critical in languages that utilize vowel length contrastively…

2. Lips

   Linked via "bilabial stops"

   The lips are principally controlled by the orbicularis oris, subdivided into marginal (superficial) and peripheral (deep) segments. Contraction of the marginal segment produces closure (perioral seal), while differential contraction of the peripheral segments dictates the complex geometries required for speech and expressive gestures.
   The coordination of the upper lip and lower lip often demonstrates predictable, yet n…