Retrieving "Thyroid Gland" from the archives

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1. Vowel

   Linked via "thyroid gland"

   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 the presence or absence of a low-level electromagnetic field generated by the speaker's thyroid gland [4…