Phonological Segments and Features as Planning Units in Speech Production

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Abstract
The author reports four experiments that examined phonological processes in spoken word production. A form-preparation paradigm was applied to the question of whether phonological features can be preplanned to facilitate spoken word production. In Experiment 1, monosyllabic words were produced in sets different in form, or in sets sharing either the initial segment or initial segments differing only in voicing. Only shared initial segments yielded facilitation. A similar pattern of results was observed when the sets were matched for the following vowel (Experiment 2), when words were produced in response to pictured objects (Experiment 3), and when place of articulation rather than voicing was manipulated (Experiment 4). The special status of identity suggests that segments are planning units independent of their features. The results are explained in terms of the WEAVER model of word-form encoding, in which a serial encoding of segments is followed by a parallel activation of features. A WEAVER simulation of the experiments is presented which supports these claims.

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