More than words: the effect of multi-word frequency and constituency on phonetic duration.

There is mounting evidence that language users are sensitive to the distributional properties of multi-word sequences. Such findings expand the range of information speakers are sensitive to and call for processing models that can represent larger chains of relations. In the current paper we investigate the effect of multi-word statistics on phonetic duration using a combination of experimental and corpus-based research. We ask (a) if phonetic duration is affected by multi-word frequency in both elicited and spontaneous speech, and (b) if syntactic constituency modulates the effect. We show that phonetic durations are reduced in higher frequency sequences, regardless of constituency: duration is shorter for more frequent sequences within and across syntactic boundaries. The effects are not reducible to the frequency of the individual words or substrings. These findings open up a novel set of questions about the interaction between surface distributions and higher order properties, and the resulting need (or lack thereof) to incorporate higher order properties into processing models.