The Psychology of Body Language We communicate needs, thoughts, and feeling through body language. Post published by Joe Navarro M.A. on Nov 29, 2009 in Spycatcher For millions of years, our early ancestors ambled on this planet, effectively navigating a very dangerous world. They did so by communicating effectively with each other their needs, observations, and desires. Impressively, they achieved this through the use of nonverbal communications; more specifically body language. Through chemical scent (musk glands we still possess), physiological changes (flushed face), gestures (pointing hand), facial reactions (quizzical look), symbols (drawings of animals), personal markers (tattoos), even vocal noises (shrieks and grunts - are not verbal communication) they succeeded in a complex environment (Givens, 1998-2005). So much of this remains with us as part of our DNA and paleo (ancient) circuitry within our brains that we still primarily communicate nonverbally, not verbally (Knapp & Hall, 1997, 400-437).
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https://www.psychologytoday.com/blog/spycatcher/200911/the-psychology-body-language
You can read the rest here:
https://www.psychologytoday.com/blog/spycatcher/200911/the-psychology-body-language