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Betteco J. de Boer, C. (Lieke) E. Peper, and Peter J. Beek

Developmental changes in bimanual coordination were examined in four age groups: 6/7, 10/11, 14/15 years, and young adults. Temporal coupling was assessed through the stabilizing contributions of interlimb interactions related to planning, error correction, and reflexes during rhythmic wrist movements, by comparing various unimanual and bimanual tasks involving passive and active movements. Spatial coupling was assessed via bimanual line-circle drawing. With increasing age, temporal stability improved. Relative contributions of planning and reflex interactions to the achieved stability did not change, whereas error correction improved. In-phase and antiphase coordination developed at similar rates; implications of this result were discussed in terms of mirror-activity inhibition. Overall spatial drawing performance (circularity, variability, smoothness) improved with age, and spatial interference was smaller in adults than children. Whereas temporal coupling increased from 6/7 years to adulthood, spatial coupling changed mainly after 14/15 years. This difference in the development of temporal and spatial coupling corresponds to the anterior-posterior direction of corpus callosum myelination as reported in the literature.

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Iraj Derakhshan

start in the major hemisphere . Clinical Neurophysiology, 127 , 3195 – 3196 . PubMed doi:10.1016/j.clinph.2016.05.367 10.1016/j.clinph.2016.05.367 Gutnik , B. , & Hyland , B. ( 1997 ). Spatial coordination in a bimanual task related to regular switching of movement vectors . Perceptual and

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Yumeng Li, Rumit S. Kakar, Marika A. Walker, Yang-Chieh Fu, Timothy S. Oswald, Cathleen N. Brown, and Kathy J. Simpson

the vector coding method could quantify the spatial coordination. 18 – 20 The vector coding method calculates the angle of the vector between adjacent data points in time on the angle-angle diagram, thus supplying spatial coordination information as well as movement dominancy of 1 segment over the

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Robert MacKenzie, Linda Monaghan, Robert A. Masson, Alice K. Werner, Tansinee S. Caprez, Lynsey Johnston, and Ole J. Kemi

legs reached forward as far as possible to hold for 3 seconds. 11 Balance was measured by the subject standing on the balls (metatarsal) of one foot for as long as possible until failure. Hand-eye spatial coordination was measured by the subject holding a card in front of them and marking a dot on the

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Jill Whitall, Farid Bardid, Nancy Getchell, Melissa M. Pangelinan, Leah E. Robinson, Nadja Schott, and Jane E. Clark

10.2466/10.25.PMS.120v18x2 Lockman , J.J. , Fears , N.E. , & Jung , W.P. ( 2018 ). The development of object fitting: The dynamics of spatial coordination . In J. Plumert (Ed.), Advances in child development and behavior: Studying the perception-action system as a model system for