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Developmental verbal dyspraxia (DVD), also known as childhood apraxia of speech (CAS) and developmental apraxia of speech (DAS), is when children have problems saying sounds, syllables, and words. This is not because of muscle weakness or paralysis. The brain has problems planning to move the body parts (e.g., lips, jaw, tongue) needed for speech. The child knows what they want to say, but their brain has difficulty coordinating the muscle movements necessary to say those words 〔(【引用サイトリンク】title=Childhood Apraxia of Speech )〕 The exact cause of this disorder is unknown.〔 Some observations suggest a genetic cause of DVD, as many with the disorder have a family history of communication disorders.〔 There is no cure for DVD, but with appropriate, intensive intervention, people with this motor speech disorder can improve significantly. ==Characteristics== There are three significant features that differentiate DVD/CAS from other childhood speech sound disorders. These features are: * "Inconsistent errors on consonants and vowels in repeated productions of syllables and words * Lengthened coarticulatory transitions between sounds and syllables * Inappropriate prosody, especially in the realization of lexical or phrasal stress" 〔 Even though DVD/CAS is a ''developmental'' disorder, it will not simply disappear when children grow older. Children with this disorder do not follow typical patterns of language acquisition and will need treatment in order to make progress.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Developmental verbal dyspraxia」の詳細全文を読む スポンサード リンク
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