2. Supplementary online information for Modelling Motor Pattern Generation in the Development of Infant Speech Paper for the eighth International Seminar on Speech Production (ISSP'08) Strasbourg, France, 8th to the 12th of December, 2008 Ian Spencer 1 Howard & Piers Messum 2 1 Biological & Machine Learning Lab, Department of Engineering, University of Cambridge, Trumpington Street, Cambridge CB2 1PZ, England, 2 Centre for Human Communication, University College London, UK E-mail: ish22@cam.ac.uk, p.messum@ucl.ac.uk

3. Important signal flow paths flow

4. Reward and effort Play Sound

5. Well synchronized breathing Play Sound

6. Poorly synchronized breathing Play Sound

7. More examples Play Sound

8. Segmentation using acoustic power Play Sound

9. Learning multi-syllable words Caregiver output As recognized by infant Best pronunciation by infant bar a b b oo Utterance The caregiver produces several 2-syllable sounds These are then segmented and recognized by the infant model The infant then pronounces them in his voice The caregiver selects his best productions