This paper reviews some of the basic premises of Quantal-Enhancement Theory as developed by K.N. Stevens and his colleagues. Quantal theory seeks to explain why some articulatory and acoustic dimensions are favored over others in distinctive feature contrasts across languages. In this paper, after a review of basic concepts, a protocol for quantal feature definitions is proposed and problems in the interpretation of vowel features are discussed. The quantal basis of distinctive feature Though most linguists and phoneticians agree that the distinctive features of spoken languages are realized in terms of concrete physical and auditory properties, there is little agreement on exactly how they are defined. According to a tradition launched by Jakobson and his collaborators (for example, Jakobson, Fant and Halle 1952), features are defined mainly in the acoustic (or perhaps auditory) domain. In a second tradition initiated by Chomsky and Halle (1968), features are defined primarily in articulatory terms. After several decades of research, these conflicting approaches have not yet led to any widely-accepted synthesis. In recent years, a new initiative has emerged within the framework of the Quantal Theory of speech, developed by K.N. Stevens and his colleagues (e.g. Stevens 1989, 2002, 2005). This theory maintains that the universal set of features is not arbitrary, but can be deduced from the interactions between the articulatory parameters of speech and their acoustic effects. The central claim is that there are phonetic regions in which the relationship between an articulatory configuration and its corresponding acoustic output is not linear. Within such regions, small changes along the articulatory dimension have little effect on the acoustic output. It is such regions of acoustic stability that define the articulatory inventories used in natural languages. In other words, these regions form the basis for a universal set of distinctive features, each of which corresponds to an articulatory-acoustic coupling within which the auditory system is insensitive to small articulatory movements. A simple example of an acoustic-articulatory coupling can be found in the parameter of vocal tract constriction. Degrees of constriction can be ordered along an articulatory continuum extending from a large opening (as in
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