Primate feedstock for the evolution of consonants

Area of Science:

• Evolutionary biology
• Linguistics
• Primatology

Background:

• The evolution of human speech is a complex and debated topic.
• Vocal learning is often considered a prerequisite for speech, but it is absent in non-human primates.
• This presents a challenge to understanding the evolutionary trajectory of speech.

Purpose of the Study:

• To propose an alternative pathway for speech evolution.
• To investigate the role of supralaryngeal vocal tract control in speech evolution.
• To examine evolutionary continuity in vocal tract control within the great ape lineage.

Main Methods:

• Comparative analysis of vocal anatomy and control across primates and other mammals.
• Review of existing literature on vocal learning and primate vocalizations.
• Phylogenetic analysis to infer evolutionary relationships and trait presence.

Main Results:

• Evidence suggests that vocal learning, as seen in birds, is not essential for speech evolution.
• Control over the supralaryngeal vocal tract, rather than vocal-fold control, appears to be a more critical factor.
• Evolutionary continuity in supralaryngeal vocal tract control is observable within the great ape family.

Conclusions:

• The evolution of speech likely involved the refinement of supralaryngeal vocal tract control, a trait shared with great apes.
• This finding offers a new perspective on the origins of human speech, bypassing the apparent lack of vocal learning in primates.
• Further research into primate vocal tract anatomy and neural control can illuminate the path to human speech.