Deafblind Users of Tadoma Speechreading Method
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Tadoma is a method of communication used by deafblind individuals, in which the deafblind person places their thumb on the speaker's lips and their fingers along the jawline. The middle three fingers often fall along the speaker's cheeks with the little finger picking up the vibrations of the speaker's throat.
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Here is research by Michele Friedner and Stefan Helmreich, MIT
sound studies meets deaf studies