LARYNGEAL RESTRICTIONS

The two main arguments in this dissertation are 1. That laryngeal cooccurrence restrictions are restrictions on the perceptual strength of contrasts between roots, as opposed to restrictions on laryngeal configurations in isolated roots, and 2. That laryngeal cooccurrence restrictions are restrictions on auditory, as opposed to articulatory, features. Both long-distance laryngeal dissimilation, where roots may have one but not two laryngeally marked stops (MacEachern 1999), and assimilation, where stops in a root must agree in laryngeal features (Hansson 2001; Rose and Walker 2004) are given a unified account based on a grammatical pressure to neutralize indistinct contrasts. This analysis is supported by the finding that certain non-adjacent sounds interact in perception. Specifically, the perception of a contrast in ejection or aspiration is degraded in roots with another ejective or aspirate as compared to another plain stop (e.g. the pair k'ap'i-kap'i is more confusable than the pair k'api-kapi). Roots that are minimally distinguished by having one vs. two laryngeally marked stops are confusable (e.g. k'ap'i is confusable with kap'i), and thus languages may avoid having both types of roots