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Human speech is produced when air pushed out of the lungs passes over the vocal folds in the larynx. This causes the vocal folds to vibrate, which creates sound.
The muscles in the larynx can adjust the length and tension of the vocal folds, which changes the pitch of the voice. Differences in the shape and length of vocal folds from person to person causes their voices to sound different from one another.

Human voice


Generally speaking, the mechanism for generating the human voice can be subdivided into three parts; the lungs, the vocal folds within the larynx, and the ...



Oct 20, 2014 ... Why can we talk but other animals can't? What makes humans so "special"? Lets find out! If you could talk to animals, what would you say?

How did humans start talking? - Science Museum


How do you learn to talk? ... How many languages can you speak? ... Some think that our human ancestors started talking as soon as their brains became large ...

Why apes can't speak like humans - CBS News


Jul 19, 2014 ... While bands of apes do have ways of communicating with one another, is it possible for nonhuman primates to speak the way humans do?

Why can humans talk?


Many scientists think one of the most special things about humans is that we are ... Another reason why we're able to speak might have to do with our genes.

Why Humans Are the Only Animals That Speak - findingDulcinea


Aug 22, 2009 ... humans speak, monkey speech ... “[T]his seems to correlate with the finding that 94% of right-handers do most of their speech and language ...

Why Do We Talk? - Top Documentary Films


Talking is something that is unique to humans, yet it still remains a mystery. ... how we learn to talk, the autistic savant who can speak more than 20 languages,  ...

Why can humans speak (communicate effectively) and other ...


Sep 1, 2015 ... When you get down to it, it's simply the fact that humans are much much smarter than any other species. We can think abstractly, we can ...

Why do humans speak so many languages? - CSMonitor.com


Nov 6, 2015 ... The ecosystem and climate people lived in might have contributed to the evolution of a language, say scientists.

Helpful Resources

From Grunting To Gabbing: Why Humans Can Talk : NPR


Aug 11, 2010 ... But unlike chimps, humans have a vocal tract that allows us to do ... more efficiently — all to further our ability to make more sounds and speak.

Why Do Humans Have Language? - The Atlantic


Jun 24, 2015 ... Why We Speak. An evolutionary biologist argues that humans started talking because they needed to negotiate. Lauren Giordano / The Atlantic ...

Tool Module: The Human Vocal Apparatus


Tool Module: The Human Vocal Apparatus. Unless there is a special problem, speaking our mother tongue is something we do so effortlessly and unconsciously ...

Why can't apes speak? — Max Planck Institute for Psycholinguistics


Unlike humans, apes lack the anatomical pre-requisites for verbal language ... Another reason why apes cannot speak is because they lack the cognitive ...

BBC - Earth - Can any animals talk and use language like humans?


Feb 16, 2015 ... Animals as diverse as elephants and parrots can mimic the sounds of human ... Their rapid rhythm precisely matched that of humans speaking.