Palatography is a technique used to identify which parts of the mouth are used when making different sounds. This technique is often used by linguists doing field work on little-known natural languages. A record made through palatography is called a palatogram. It involves painting a coloring agent, such as a dye or a mixture of charcoal and olive...
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http://en.wikipedia.org/wiki/Palatography
recording position of tongue against hard palate during speech
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http://phrontistery.info/p.html
palatography The recording of movements of the palate in speech.
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http://www.wordinfo.info/words/index/info/view_unit/1556/2
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