To reveal the entity of the lateral articulation which is a type of the misarticulation pronounced flowing out the air stream from the retromolar region to the angle of the mouth through the buccal groove,260 sounds diagnosed as the lateral articulation and 33 sounds suspected as it in 7 cleft palate patients who have sufficient velopharyngeal function after early operation were analysed by confusion matrix paradigm for phonemic feature and by dynamic palatography and cephalometric radiography with contrast medium attached to the tongue and palate for the tongue movement.
The results obtained were as fo llows.
1. The lateral articulation were observed in the Japanese CV or CSV syllables containing vowel [i.e], semivowel [j], consonants [s, ts, dz] and [ke, ge].
2. The manner of the tongue movement was the “closure maintaining manner” inwhich the tongue was contacted to the hard palate continuously during pronunciation.
3. The duration obtaining the “closed type” o f palatogram were from the production of consonants to vowels in the syllables followed by vowel /i/, from the production of consonants to the transition for the syllables followed by semivowel /j/, and during the production of consonants for syllables preceeded b y the consonants /s/ /t/ /z/. But, it was varialble for syllables /se, ze, ke, ge/.
4. The “Max” type in which whole palate were closed with the tongue were most frequently observed at the time of maximum contact and “Tb2”, “T2” were next in order of numbers. 5. By the phonemic analysis, dental, alveolar and palatoalveo l ar sounds were transcribed as sounds in which the place of articulation were more backwards than the sounds intended. [t∫, d
3] and [k, g ] or [∫]and [C] were confused each other.
From these results it is concluded that the lateral articulation of Japanese CV or CSV sounds were produced mainly as the disorders of the vowel /i/ /e/, semivowel /j/ and consonants /s/ /t/ /z/ du e to the broad contact of the tongue and hard palate during pronunciation.
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