In this paper we focused on a pause in the speech, and analyzed the factors affecting pause duration. It has been considered that utterance duration just before the pause is the only factor affecting pause duration (preboundary effect), recently effect of utterance duration just after the pause has also been noticed (postboundary effect). However, the relation between two utterance durations and pause duration sandwiched by the utterances has not been analyzed. Therefore we analyzed these factors inclusively. We proposed a simple utterance phrase (XY utterance phrase) consisting of two words in speech experiment and analyzed the relation between pause duration and utterance durations. The results showed that utterance duration just before the pause affected pause duration, and suggested that the relation between prior and posterior utterance duration affected pause duration. These results mean that not only a pre or postboundary effect but also a pre-postboundary effect may exist in speech, and we discussed its mechanism.
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