Is morphosyntactic agreement reflected in acoustic detail? The s duration of English regular plural nouns

Studies have challenged the assumption that different types of word-final s in English are homophonous. On the one hand, affixal (e.g. laps) and non-affixal s (e.g. lapse) differ in their duration; on the other hand, variation exists across several types of affixal s (e.g. between the plural (cars) and genitive plural (cars')). This line of research was recently expanded in a study in which an interesting side effect appeared: the s was longer if followed by a past tense verb (e.g. The pods/odds eventually dropped), in comparison to a following present tense verb (e.g. The old screens/jeans obviously need replacing.). Put differently, the s became longer in the absence of overt morphosyntactic agreement, where it was mostly the sole plurality marker in the sentence. The objective of the present article is to examine whether this effect can be replicated in a more controlled setting. Having considered a large number of potential confounding variables in a reading experiment, we found an effect in the expected direction, one that is compatible with the literature on the impact that predictability has on duration. We interpret this finding against the background of the role of fine acoustic detail in language.