Production
Goto (1971) reports that Japanese speakers who cannot hear the difference between /r/ and /l/ may still learn to produce the difference, presumably through articulatory training in which they learn the correct places and manners of articulation required for the production of the two sounds. In this sense, they learn to produce /r/ and /l/ in much the same way a deaf person would. Although they have only a single acoustic image corresponding to a single phoneme intermediary between /r/ and /l/, they can determine they are producing the correct sound based on the tactile sensations of the speech articulators (i.e. tongue, alveolar ridge, etc.) coming into contact with each other without any auditory feedback or confirmation that they are indeed producing the sound correctly.
Read more about this topic: Japanese Speakers Learning R And L
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