caa a22 4500 445351837 CHVBK 20180317142846.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00221-011-2645-8 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2645-8 On the relation between action selection and movement control in 5- to 9-month-old infants [Elektronische Daten] [Margot van Wermeskerken, John van der Kamp, Geert Savelsbergh] Although 5-month-old infants select action modes that are adaptive to the size of the object (i.e., one- or two-handed reaching), it has largely remained unclear whether infants of this age control the ensuing movement to the size of the object (i.e., scaling of the aperture between hands). We examined 5-, 7-, and 9-month-olds' reaching behaviors to gain more insight into the developmental changes occurring in the visual guidance of action mode selection and movement control, and the relationship between these processes. Infants were presented with a small set of objects (i.e., 2, 3, 7, and 8cm) and a large set of objects (i.e., 6, 9, 12, and 15cm). For the first set of objects, it was found that the infants more often performed two-handed reaches for the larger objects based on visual information alone (i.e., before making contact with the object), thus showing adaptive action mode selection relative to object size. Kinematical analyses of the two-handed reaches for the second set of objects revealed that inter-trial variance in aperture between the hands decreased with the approach toward the object, indicating that infants' reaching is constrained by the object. Subsequent analysis showed that between hand aperture scaled to object size, indicating that visual control of the movement is adjusted to object size in infants as young as 5months. Individual analyses indicated that the two processes were not dependent and followed distinct developmental trajectories. That is, adaptive selection of an action mode was not a prerequisite for appropriate aperture scaling, and vice versa. These findings are consistent with the idea of two separate and independent visual systems (Milner and Goodale in Neuropsychologia 46:774-785, 2008) during early infancy. The Author(s), 2011 Infant reaching nationallicence Action mode selection nationallicence Movement control nationallicence Bimanual reaching nationallicence Aperture scaling nationallicence Two-visual systems model nationallicence van Wermeskerken Margot Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut van der Kamp John Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut Savelsbergh Geert Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 51-62 0014-4819 211:1<51 2011 211 221 https://doi.org/10.1007/s00221-011-2645-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2645-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van Wermeskerken Margot Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- van der Kamp John Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 700 1- Savelsbergh Geert Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 51-62 0014-4819 211:1<51 2011 211 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer