caa a22 4500 445351888 CHVBK 20180317142846.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s00221-011-2673-4 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2673-4 Physically coupling two objects in a bimanual task alters kinematics but not end-state comfort [Elektronische Daten] [Charmayne Hughes, Jeffrey Haddad, Elizabeth Franz, Howard Zelaznik, Joong Ryu] People often grasp objects with an awkward grip to ensure a comfortable hand posture at the end of the movement. This end-state comfort effect is a predominant constraint during unimanual movements. However, during bimanual movements the tendency for both hands to satisfy end-state comfort is affected by factors such as end-orientation congruency and task context. Although bimanual end-state comfort has been examined when the hands manipulate two independent objects, no research has examined end-state comfort when the hands are required to manipulate two physically-coupled objects. In the present experiment, kinematics and grasp behavior during a unimanual and bimanual reaching and placing tasks were examined, when the hands manipulate two physically-connected objects. Forty-five participants were assigned to one of three groups; unimanual, bimanual no-spring (the objects were not physically connected), and bimanual spring (the objects were connected by a spring), and instructed to grasp and place objects in various end-orientations, depending on condition. Physically connecting the objects did not affect end-state comfort prevalence. However, it resulted in decreased interlimb coupling. This finding supports the notion of a flexible constraint hierarchy, in which action goals guide the selection of lower level action features (i.e., hand grip used for grasping), and the particular movements used to accomplish that goal (i.e., interlimb coupling) are controlled throughout the movement. Springer-Verlag, 2011 Bimanual coordination nationallicence Grasping and placing nationallicence End-state comfort nationallicence Hughes Charmayne Faculty of Psychology and Sport Sciences, Bielefeld University, 33501, Bielefeld, Germany aut Haddad Jeffrey Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut Franz Elizabeth Department of Psychology, University of Otago, 9054, Dunedin, New Zealand aut Zelaznik Howard Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut Ryu Joong Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut Experimental Brain Research Springer-Verlag 211/2(2011-06-01), 219-229 0014-4819 211:2<219 2011 211 221 https://doi.org/10.1007/s00221-011-2673-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2673-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hughes Charmayne Faculty of Psychology and Sport Sciences, Bielefeld University, 33501, Bielefeld, Germany aut NATIONALLICENCE 700 1- Haddad Jeffrey Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Franz Elizabeth Department of Psychology, University of Otago, 9054, Dunedin, New Zealand aut NATIONALLICENCE 700 1- Zelaznik Howard Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Ryu Joong Department of Health and Kinesiology, Purdue University, 47907, West Lafayette, IN, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 211/2(2011-06-01), 219-229 0014-4819 211:2<219 2011 211 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer