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Rehabilitation Practice and Science

Translated Title

使用超音波觀測學齡前孩童構音時之舌頭動作

Abstract

Ultrasound imaging provides a unique and complete representation of tongue structure in almost all planes of interest and is rapid enough to record real-time tongue movement during speech. Recording tongue movement with ultrasound is non-invasive, and has not been shown to have any biologic effects in humans at diagnostic intensities. As a result, ultrasound has been widely used in speech studies to measure tongue functions in recent years. However, these previous studies are subject to inconsistent plane images caused by additionally movement of the traditional handheld transducer. The artifacts that result from depression of the submental soft tissue contacted by the mobilized transducer during speaking activity have also been a limiting factor. In addition, to the best of our knowledge, it would appear that few studies have addressed ultrasonic measurement of tongue movement with regard to young children’s speech behavior. Consequently, the purpose of our study was to apply the dynamic tongue imaging technique and the cushion-scanning technique (CST) to investigate and analyze tongue movement during articulation in young preschool children.Forty Mandarin-speaking preschool children of normal development were asked to enunciate and repeat 8 target sounds. During individual articulation, the real-time tongue movement patterns in B-mode and M-mode of ultrasonography were comprehensively recorded, inspected, and analyzed. The tongue movement modes of these 8 target sound articulations were classified into three types based on the similarity which was observed in the B-mode and M-mode of the ultrasonographic examination: (1) /a/ &/ha/ (2) /da/, /ta/, /na/, & /la/ (3) /ga/ & /ka/. In addition, there was no significant difference in the range of tongue movement in the midsagittal plane during selected articulation between boys and girls. (p＜.05). CST in combination with B-mode and M-mode ultrasonography yielded excellent analysis of tongue movement during articulation in young children. It provided information about the place of articulation instead of the manner of articulation among different vowels or consonants. In the present study, the movement modes of Mandarin speaking children of normal-development could be used as the standard and compared with the movement modes of those children with articulation or other associated disorders.

Language

Traditional Chinese

First Page

147

Last Page

157

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