Seegelke Christian, Hughes Charmayne M L, Knoblauch Andreas, Schack Thomas
Neurocognition and Action Research Group, Faculty of Psychology and Sport Sciences, Bielefeld University, 33501 Bielefeld, Germany; Research Institute for Cognition and Robotics (CoR-Lab), 33501 Bielefeld, Germany.
Acta Psychol (Amst). 2013 Nov;144(3):513-21. doi: 10.1016/j.actpsy.2013.09.002. Epub 2013 Oct 2.
The present study examined adaptations in the planning of initial grasp postures during a multi-segment object manipulation task. Participants performed a grasping and placing task that consisted of one, two, or three movement segments. The position of the targets was manipulated such that the degree of object rotation between the home and temporally proximal positions, and between the temporally proximal and distal target positions, varied. Participants selected initial grasp postures based on the specific requirements of the temporally proximal and temporally distal action segments, and adjustments in initial grasp posture depended on the temporal order of target location. In addition, during the initial stages of the experimental session initial grasp postures were influenced to a larger extent by the demands of the temporally proximal segment. However, over time, participants overcame these cognitive limitations and adjusted their initial grasp postures more strongly to the requirements of the temporally distal segment. Taken together, these results indicate that grasp posture planning is influenced by cognitive and biomechanical factors, and that participants learn to anticipate the task demands of temporally distal task demands, which we hypothesize, reduce the burden on the central nervous system.
本研究考察了在多段物体操纵任务中初始抓握姿势规划的适应性。参与者执行了一项抓握和放置任务，该任务由一个、两个或三个动作段组成。对目标的位置进行了操纵，使得物体在起始位置和时间上接近的位置之间，以及在时间上接近的位置和远端目标位置之间的旋转程度有所不同。参与者根据时间上接近和时间上远端动作段的具体要求选择初始抓握姿势，并且初始抓握姿势的调整取决于目标位置的时间顺序。此外，在实验阶段的初始阶段，初始抓握姿势在更大程度上受到时间上接近段需求的影响。然而，随着时间的推移，参与者克服了这些认知限制，并根据时间上远端段的要求更强烈地调整了他们的初始抓握姿势。综上所述，这些结果表明抓握姿势规划受到认知和生物力学因素的影响，并且参与者学会了预测时间上远端任务需求，我们推测这减轻了中枢神经系统的负担。
