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. 2017 Feb 24;8:14579. doi: 10.1038/ncomms14579

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Copyright © 2017, The Author(s)

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(a) The LIG's resistance changes towards the throat vibrations of the tester who makes two successive coughs, hums, screams, swallowing and nods. (b) The LIG's resistance change caused by four different kinds of hum tones and the hum tone 2 is same with the hum in a. (c) The relative resistance change of LIG increases with the increase of the sound intensities of the hum.