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Prespeech motor learning in a neural network using reinforcement

Warlaumont, Anne and Westermann, Gert and Buder, Eugene and Oller, D. Kimbrough (2013) Prespeech motor learning in a neural network using reinforcement. Neural Networks, 38. pp. 64-75. ISSN 0893-6080

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Abstract

Vocal motor development in infancy provides a crucial foundation for language development. Some significant early accomplishments include learning to control the process of phonation (the production of sound at the larynx) and learning to produce the sounds of one's language. Previous work has shown that social reinforcement shapes the kinds of vocalizations infants produce. We present a neural network model that provides an account of how vocal learning may be guided by reinforcement. The model consists of a self-organizing map that outputs to muscles of a realistic vocalization synthesizer. Vocalizations are spontaneously produced by the network. If a vocalization meets certain acoustic criteria, it is reinforced, and the weights are updated to make similar muscle activations increasingly likely to recur. We ran simulations of the model under various reinforcement criteria and tested the types of vocalizations it produced after learning in the different conditions. When reinforcement was contingent on the production of phonated (i.e. voiced) sounds, the network's post learning productions were almost always phonated, whereas when reinforcement was not contingent on phonation, the network's post-learning productions were almost always not phonated. When reinforcement was contingent on both phonation and proximity to English vowels as opposed to Korean vowels, the model's postlearning productions were more likely to resemble the English vowels and vice versa.

Item Type: Article
Journal or Publication Title: Neural Networks
Uncontrolled Keywords: Infant vocalization ; Motor development ; Neural network ; Reinforcement ; Neuromuscular control ; Articulatory speech synthesis
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Departments: Faculty of Science and Technology > Psychology
ID Code: 59987
Deposited By: ep_importer_pure
Deposited On: 14 Nov 2012 09:16
Refereed?: Yes
Published?: Published
Last Modified: 30 Sep 2013 15:25
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/59987

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