Title: Learning about Gravity: Segmental Assessment of Upright Control as Infants Develop

3 Authors: Saavedra, Sandra L 4 Van Donkelaar, Paul 5 Woollacott, Marjorie H 6 7 8 Author Contributions: 9 10 Sandra Saavedra conceived the study design, support frame design and EMG harness 11 design, collected and analyzed data, interpreted the results, prepared figures and drafted 12 the manuscript. 13 14 Paul van Donkelaar advised on study design, support frame design, and classification of 15 behavioral stages, consulted on grant applications and manuscript. 16 17 Marjorie Woollacott advised on study design, support frame design, EMG and kinematic 18 analysis, funded the project, and consulted on interpretation of the results, preparation of 19 figures and manuscript. 20 21 22 Affiliation 23 1 Department of Human Physiology and Institute of Neuroscience, University of Oregon, 24 Eugene, OR, USA. 25 26 Running head: (60 character limit including spaces, 60 characters) 27 Learning about gravity: development of upright trunk control 28 29 Corresponding Author contact information: 30 31 Sandra L Saavedra 32 School of Kinesiology 33 University of Michigan 34 401 Washtenaw Avenue, Room 4726 35 Ann Arbor, MI 48109-2214 36 37 [email protected] 38 phone: 503-510-9142 or 734-615-1494 39 fax: 734-936-1925 40 41 42 43 44 Articles in PresS. J Neurophysiol (July 25, 2012). doi:10.1152/jn.01193.2011