変換聴覚フィードバック課題における発声F0応答の男女差

摘要

流暢な発話においては，自己音声の聴覚フィードバックと発話制御に関わる諸器官が精緻な時間精度で円滑に連携する.発話の非流暢な吃音着では，聴覚・発話系に障害がある.吃音の発症率と治癒率には男女差があり，その背景に聴覚・発話系の機能的な違いが存在する可能性があるが，その詳細は明らかではない.本研究では，発声中の聴覚フィードバックのピッチ変調に対する発声F0応答の特性を男女間で比較した.実験の結果，男性被験者では女性被験者に比べ，聴覚フィードバックのピッチ変化を補正する発声F0応答が相対的に低く，聴覚・発話系の機能的な男女差の一端が示された.%Fluent speech requires smooth coordination of organs involved in auditory-vocal systems in precise timing. In the case of persons with stutters, their disfluency in speech derives from the impairment in the auditory-vocal system. It is well known that there are gender differences in both of the incidence and the cure rate of the stuttering, however, the phenomenological details have not been clarified. This study conducted the pitch-shifted auditory feedback task and compared the voice FO responses between adult males and females. The result showed that the compensatory voice FO responses to the pitch-shifted feedback were relatively lower in males than females, suggesting the functional differences in auditory-vocal systems between adult males and females.