caa a22 4500 44535352X CHVBK 20180317142852.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s00221-011-2695-y doi (NATIONALLICENCE)springer-10.1007/s00221-011-2695-y Anticipatory scaling of grip forces when lifting objects of everyday life [Elektronische Daten] [Joachim Hermsdörfer, Yong Li, Jennifer Randerath, Georg Goldenberg, Sandra Eidenmüller] The ability to predict and anticipate the mechanical demands of the environment promotes smooth and skillful motor actions. Thus, the finger forces produced to grasp and lift an object are scaled to the physical properties such as weight. While grip force scaling is well established for neutral objects, only few studies analyzed objects known from daily routine and none studied grip forces. In the present study, eleven healthy subjects each lifted twelve objects of everyday life that encompassed a wide range of weights. The finger pads were covered with force sensors that enabled the measurement of grip force. A scale registered load forces. In a control experiment, the objects were wrapped into paper to prevent recognition by the subjects. Data from the first lift of each object confirmed that object weight was anticipated by adequately scaled forces. The maximum grip force rate during the force increase phase emerged as the most reliable measure to verify that weight was actually predicted and to characterize the precision of this prediction, while other force measures were scaled to object weight also when object identity was not known. Variability and linearity of the grip force-weight relationship improved for time points reached after liftoff, suggesting that sensory information refined the force adjustment. The same mechanism seemed to be involved with unrecognizable objects, though a lower precision was reached. Repeated lifting of the same object within a second and third presentation block did not improve the precision of the grip force scaling. Either practice was too variable or the motor system does not prioritize the optimization of the internal representation when objects are highly familiar. Springer-Verlag, 2011 Sensorimotor control nationallicence Anticipation nationallicence Grasping and lifting nationallicence Grip force nationallicence Internal model nationallicence Hermsdörfer Joachim Department of Sport and Health Science, Technische Universität München, Connollystraße 32, 80809, Munich, Germany aut Li Yong Department of Neurology, Hospital Rechts der Isar, Technische Universität München, Munich, Germany aut Randerath Jennifer Department of Psychology, University of Oregon, Eugene, OR, USA aut Goldenberg Georg Department of Neuropsychology, Bogenhausen Hospital, Munich, Germany aut Eidenmüller Sandra Clinical Neuropsychology Research Group (EKN), Department of Neuropsychology, Bogenhausen Hospital, Munich, Germany aut Experimental Brain Research Springer-Verlag 212/1(2011-07-01), 19-31 0014-4819 212:1<19 2011 212 221 https://doi.org/10.1007/s00221-011-2695-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00221-011-2695-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hermsdörfer Joachim Department of Sport and Health Science, Technische Universität München, Connollystraße 32, 80809, Munich, Germany aut NATIONALLICENCE 700 1- Li Yong Department of Neurology, Hospital Rechts der Isar, Technische Universität München, Munich, Germany aut NATIONALLICENCE 700 1- Randerath Jennifer Department of Psychology, University of Oregon, Eugene, OR, USA aut NATIONALLICENCE 700 1- Goldenberg Georg Department of Neuropsychology, Bogenhausen Hospital, Munich, Germany aut NATIONALLICENCE 700 1- Eidenmüller Sandra Clinical Neuropsychology Research Group (EKN), Department of Neuropsychology, Bogenhausen Hospital, Munich, Germany aut NATIONALLICENCE 773 0- Experimental Brain Research Springer-Verlag 212/1(2011-07-01), 19-31 0014-4819 212:1<19 2011 212 221 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer