Causal analysis of acoustic and linguistic factors related to speech planning in Japanese monologs

Publication Type:

Conference Paper


The 7th Workshop on Disfluency in Spontaneous Speech (DiSS 2015), Edinburgh, Scotland (2015)


boundary pitch movements, clause-final lengthening, DiSS, fillers, path models, pauses


In this paper, we applied a general method of testing path models, investigating causal relationship between cognitive load in speech planning and four types of disfluencies in Japanese monologs. The four disfluencies examined were i) clause-initial fillers, ii) inter-clausal pauses, iii) clause-final lengthening, and iv) boundary pitch movements, which occurred at weak clause boundaries. The length of the constituents following weak clause boundaries was assumed to be a measure of the complexity affecting the cognitive load. By using a model selection technique based on the AIC, we found an optimal model with the smallest AIC, in which the constituent complexity had direct effects on all of the four disfluency variables. In addition, some of the disfluencies influenced one another; clause-final lengthening was enhanced by the presence of a boundary pitch movement and the occurrence of clause-initial fillers was affected by all the other three disfluency variables.


University of Edinburgh; August 8-9, 2015