Abstract
In English, nasal place assimilation occurs across word boundaries, such as ten bucks pronounced as te[m] bucks. Assimilation can be viewed as a reduction or loss of the assimilation target’s place cue (/n/ in ten), and simultaneously as an enhancement of the assimilation trigger’s place cue (/b/ in bucks) by spreading its place cue earlier in the signal. A message-oriented phonological approach predicts that assimilation is sensitive to the relative contextual inferrability of both the target and trigger words: More assimilation should be observed for more contextually predictable target words, while less assimilation should be observed for contextually more predictable trigger words. These predictions deviate from accounts that view assimilation solely as reduction. To test these predictions, sequences which license assimilation were extracted from a conversational speech corpus. Both categorical assimilation (based on close phonetic transcription) and gradient acoustic assimilation (based on F2) were analyzed. As predicted, assimilation was more likely both when a target like ten was high in predictability and when its trigger bucks was low in predictability. Assimilation thus serves as both reduction and enhancement, and can be used to manage redundancy in the speech signal. More broadly, this constitutes evidence for the influence of communicative pressures on phonology.
Highlights
Assimilation, the sound pattern whereby one sound acquires a phonetic property from a neighbouring sound (e.g., [nb] ~ [mb]), is one of the most widespread phonological phenomena in the world’s languages
On the understanding that English place assimilation is a phonetically gradient process (Ellis & Hardcastle, 2002), we examine assimilation using a continuous acoustic measure based on formant transitions
Tokens that were transcribed as phonetically assimilated have higher assimilation scores than those transcribed as canonical [n], and this is true within all vowel types in the data
Summary
Assimilation, the sound pattern whereby one sound acquires a phonetic property from a neighbouring sound (e.g., [nb] ~ [mb]), is one of the most widespread phonological phenomena in the world’s languages. Turnbull et al: Nasal place assimilation trades off inferrability of both target and trigger words. The observation that production and perceptual factors play a role in predicting assimilation is consistent with the view that sound patterns are shaped by communicative biases towards accurate message transmission and low resource cost (e.g., Lindblom, 1990; Hall, Hume, Jaeger, & Wedel, 2016). From this perspective, reduction of an inherently weakly perceptible segment in an articulatorily difficult context can be viewed as maintaining low resource cost. There is little communicative gain in investing resources in the clear production of the segment since it contributes little to the probability that the word will be successfully recognized (inferrability)
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