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Tadoma method

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A technique devised in Norway in the 1890s to enable a person who is both blind and deaf to receive and interpret speech by placing a thumb lightly in contact with the speaker's lips and the fingers of the same hand on the speaker's jaw and neck, thereby detecting by touch the pattern of airflow from the speaker's mouth and nose, the articulatory movements, and the vibrations from the vocal tract, permitting a well-practised user of the system to achieve a modest comprehension of slow speech. [Named after two deaf-blind children, Tad Chapman and Oma Simpson, who in the early 1960s were the first to use the system in the United States]

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