Five pieces of evidence suggesting large lookahead in spontaneous monologue

There is considerable disagreement among the researchers of speech production with respect to the range of lookahead or pre-planning. In this paper, five pieces of evidence suggesting the presence of relatively large lookahead in spontaneous monologues are presented, based on the analyses of the Corpus of Spontaneous Japanese. This evidence consistently suggests that the range of a lookahead is six to seven accentual phrases long, which corresponds on average to 3–4 seconds in the time domain.