caa a22 4500 445351780 CHVBK 20180317142846.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s00221-011-2628-9 doi (NATIONALLICENCE)springer-10.1007/s00221-011-2628-9 Within-trial modulation of multi-digit forces to friction [Elektronische Daten] [Wei Zhang, Andrew Gordon, Tara McIsaac, Marco Santello] Tactile signals from the fingertips play a crucial role in the planning and control of object manipulations. Specifically, subjects adapt their digit forces to the object physical properties, including the friction at the object surface, to perform object manipulation while preventing slipping or dropping. This study addressed the adaptation of multi-digit forces to friction that occurs within a trial (from contact to onset of object manipulation) and across trials. Ten healthy participants were instructed to grasp, lift, hold, and release a grip device with five digits under four texture conditions: (1) all digits on rayon (R-R), (2) all digits on sandpaper (S-S), (3) thumb on sandpaper and fingers on rayon (S-R), and (4) thumb on rayon and fingers on sandpaper (R-S). Changing the texture conditions elicited significant changes from object contact to lift onset on digit normal force and center of pressure, as well as on the safety margins and force sharing patterns, e.g., normal forces exerted by each finger expressed as percentage of thumb normal forces. Furthermore, these friction effects were found on the very first trial and were observed throughout the remainder of the trials, thus indicating that force adaptation occurred within the first manipulation. Finally, a highly linear relation between the safety margin at object lift onset and object hold confirmed that digit force adaptation to friction occurred before object lift onset. These findings are discussed in relation to the role of tactile input in force modulation during the early phase of multi-digit grasping. Springer-Verlag, 2011 Force coordination nationallicence Adaptation nationallicence Friction nationallicence Grasping nationallicence Fingers nationallicence Hand nationallicence Zhang Wei School of Biological and Health Systems Engineering, Arizona State University, 85287, Tempe, AZ, USA aut Gordon Andrew Department of Biobehavioral Sciences, Teachers College, Columbia University, 10027, New York, USA aut McIsaac Tara Department of Biobehavioral Sciences, Teachers College, Columbia University, 10027, New York, USA aut Santello Marco School of Biological and Health Systems Engineering, Arizona State University, 85287, Tempe, AZ, USA aut Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 17-26 0014-4819 211:1<17 2011 211 221 https://doi.org/10.1007/s00221-011-2628-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2628-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhang Wei School of Biological and Health Systems Engineering, Arizona State University, 85287, Tempe, AZ, USA aut NATIONALLICENCE 700 1- Gordon Andrew Department of Biobehavioral Sciences, Teachers College, Columbia University, 10027, New York, USA aut NATIONALLICENCE 700 1- McIsaac Tara Department of Biobehavioral Sciences, Teachers College, Columbia University, 10027, New York, USA aut NATIONALLICENCE 700 1- Santello Marco School of Biological and Health Systems Engineering, Arizona State University, 85287, Tempe, AZ, USA aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 211/1(2011-05-01), 17-26 0014-4819 211:1<17 2011 211 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer