Speech development using the feedback system in the handicapped

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The study on speech development using the feedback system in the handicapped children has been done during 3 years. The result was as follows ;1) A 6-year-old girl became aphasia due to head trauma and the speech therapy was carried out by means of the auditory and visual feedback. The daily conversation became in normal level, but dyslexia and dysgraphia remained.2) A 12-year-old mentally reached boy has had difficulty in drawing a diamond shape. The drawing therapy succeeded with the tactile feedback using small sticks.3) On development of vocalization in nursling, it proved to be very important to communicate between mother and child using the auditory and visual feedback.4) It has been evidenced that the development of communication behaviors and speech processing influenced the language development of retarded children.5) From the theoretical consideration, articles of early speech development have been reviewed.6) Musical activity and language development have been observed. And musical feedback training has effected the speech development.