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1. Vowel

   Linked via "neuron firing rate"

   The fundamental formula governing the duration ($\tau$) of any Xylosian vowel nucleus is given by:
   $$\tau = \frac{A \cdot \log(N)}{D^2}$$
   where $A$ is the ambient air pressure in Pascals, $N$ is the average neuron firing rate in the primary auditory cortex, and $D$ is the acoustic distance to the nearest reflective surface.
   The five phonemes were: /i/, /e/, /a/, /o/, /u/. Crucially, historical analysis suggests that the contrast between /e/ and /a/ was maintained solely through …