We often experience profoundly hearing-impaired infants who show characteristic behaviors resembling symptoms of attention deficit/hyperactivity disorder (ADHD), such as distraction, concentration difficulty and restlessness. As a result, in cases actually associated with ADHD, ADHD may be misdiagnosed and special support may not be practiced. Furthermore, no reports have been made concerning development of auditory function, language and characteristic behaviors in hearing-impaired infants with ADHD. In this study, we therefore followed development of auditory function, language and characteristic behaviors in a hearing-impaired infant suspected with ADHD between the ages of 3 and 6, and discussed his developmental problems in terms of auditory function, language and characteristic behaviors as compared with two profoundly hearing-impaired infants without ADHD (hearing-impaired only) of the same age. The results led to the following assessments. 1) After a set period of auditory and language training, characteristic behaviors of hyperactivity and inattention ease in hearing-impaired-only cases. 2) In ADHD suspected case, although characteristic behaviors of hyperactivity ease, characteristic behaviors of inattention and impulsivity are difficult to reduce. 3) Compared with hearing-impaired-only cases, acquisition of a visual communication mode such as lip reading, finger spelling or written words does not improve, speech perception ability develops very slowly, and acquisition of spoken words is delayed in ADHD suspected case.
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