音声や手話は対話型言語であり，リアルタイムで円滑なコミュニケーションを行うことが可能である．日本語音声対話については数多くの研究が行われてきたが，日本手話対話については，まだまだ未解明な部分が多い．日本手話対話では日本語音声対話に比べて，発話の重なりが多く見られ，さらに重なりが話者交替時にも生じていることが明らかにされている．%In this research, we analyzed the overlap phenomena at turn-taking points in Japanese Sign Language Dialogue. The spontaneous dialogue data were recorded in the environment where they can look at each other via prompters and three dialogue data by six native signers were used for the analysis. First, it was shown that the overlaps at turn-taking point occurred with very high frequency (75%). Secondly, we analyzed these phenomena based on "turn-taking system for conversation" by H. Sacks, E. A. Schegloff and G Jefferson and found the situations where the speaker (signer) continued his/her utterance after TRP(transition-relevance place) and the next speaker started his/her turn by recognizing or projecting the TRP, therefore the overlap occurred. We consider these types of overlap as the normal turn-taking. Finally, there were a few case (18%) where the turn-taking rule was broken and the other cases follow the rule.
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