Why Do You Stick Out Your Tongue When You Concentrate?

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Have you ever done something that required a ton of concentration, like threading a needle, and noticed that sometimes your tongue pokes out involuntarily? It turns out this reflex could be a leftover from the evolution of human language!

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Sources:
http://www.devcogneuro.com/Publications/motor_%26_cog_paper.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3324315/
https://www.ncbi.nlm.nih.gov/pubmed/4029519/
https://pdfs.semanticscholar.org/7e36/52b77387ed4c911d9d78b220f79e8156a28b.pdf
https://www.researchgate.net/publication/9004569_From_Mouth_to_Hand_Gesture_Speech_and_the_Evolution_of_Right-Handedness

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