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 durations has not been analyzed. Therefore we analyzed these factors inclusively. We proposed a simple sentence (XY sentence) in reading test and used two-way analysis
of variance (ANOVA) for analyzing the contribution of factors. As a result, we found two factors affecting a pause. One is utterance duration just before the pause which was aleardy observed, and the other is the ratio of prior and posterior utterance duration. These results mean that not only a pre or postboundary effect but also a pre-postboundary effect exist in speech, and we discussed its mechanism.
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