Abstract
This paper shows how an articulatory model, able to produce acoustic signals from articulatory motion, can learn to speak i.e. coordinate its movements in such a way that it utters meaningful sequences of sounds belonging to a given language. This complex learning procedure is accomplished in four major steps: (a) a babbling phase, where the device builds up a model of the forward transforms i.e. the articulatory-to-audio-visual mapping; (b) an imitation stage, where it tries to reproduce a limited set of sound sequences by audio-visual-to-articulatory inversion; (c) a “shaping” stage, where phonemes are associated with the most efficient available sensori-motor representation; and finally, (d) a “rhythmic” phase, where it learns the appropriate coordination of the activations of these sensori-motor targets.
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