This position of the larynx makes the vocal tract longer, making it possible to produce a variety of speech sounds, particularly the subtle distinctions among vowel sounds that our ancestors could not and other primates cannot make.
This position of the larynx makes the vocal tract longer, making it possible to produce a variety of speech sounds, particularly the subtle distinctions among vowel sounds that our ancestors could not and other primates cannot make. Scientists call this the LDT and for many years, it was the most widely accepted view.