Tadoma
Tadoma is the name of an artificial language that can be used to communicate with people who were born both blind and deaf ( deafblindness ).
The Tadoma system was developed in Norway in 1890 . It was named after the two deaf-blind children Tad Chapman and Grandma Simpson , who first used it. Tadoma is a language of touch in which the speech signals are perceived by feeling the articulation movements on the speaker's face. Most of the time, the thumb records the lip movements while the remaining fingers touch the cheek and neck.