The larynx-phonation area is the primary motor region controlling the larynx and vocalization. This area is not found un non-human primates and grants humans a degree of control over the larynx —colloquially known as the voice box— that is unparalleled among mammals. Gaining flexible control over the larynx was a key step towards the evolution of language and speech.
The subcentral gyrus acts as a second motor controlling centre for the larynx. How these two larynx areas communicate to jointly control the vocal organ remains a fundamental mystery. Furthermore, it remains unclear how two larynx-motor areas have evolved in the human brain from a non-human primate precursor that contains only one.