Posture based motor planning in a sequential grasping task |
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| Authors: | Breanna E Studenka Christian Seegelke Christoph Schütz Thomas Schack |
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| Institution: | 1. Neurocognition and Action Research Group, Faculty of Psychology and Sport Sciences, Bielefeld University, Bielefeld, Germany;2. Research Institute for Cognition and Robotics (CoR-Lab), Bielefeld University, Bielefeld, Germany;3. Center of Excellence Cognitive Interaction Technology (CITEC), Bielefeld University, Bielefeld, Germany;1. Department of Cognitive Neuroscience, University of Bielefeld, 33615 Bielefeld, Germany;2. CITEC: Cognitive Interaction Technology - Center of Excellence, University of Bielefeld, 33615 Bielefeld, Germany;1. SCALab, CNRS UMR 9193, Univ. Lille, France;2. Institut Universitaire de France, Paris, France;3. Human Cognitive Neuroscience, Psychology, University of Edinburgh, Edinburgh, UK;4. Department of Psychology and Cognitive Sciences, University of Trento, Italy;1. School of Psychology, University of Birmingham, Birmingham B15 2TT, UK;2. Department of Experimental Psychology, University of Oxford, UK |
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| Abstract: | Movement planning in sequential tasks is revealed by grasping postures. We explored aspects of planning a sequential drawer opening and object manipulation task with regard to arm and torso postures. We conducted a detailed kinematic analysis of joint postures at the wrist, elbow, and shoulder for a one-grasp and a two-grasp sequence of movement. The second of the two-grasp sequence was constrained (uncomfortable). We predicted that planning for the second grasp in a two-grasp sequence would influence arm, torso, and whole-body postures at the first grasp. Participants prepared for the second grasp by adjusting the posture of the elbow and shoulder and the distance they stepped to the drawer. The joint postures at the elbow and shoulder changed in the direction of the intended object grasp. These findings show that anticipatory adjustments are revealed at postures other than the end-effector and lend insight into the mechanisms of sequential movement planning. |
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