Grasping movement plans |
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Authors: | David A Rosenbaum Erin S Halloran Rajal G Cohen |
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Institution: | (1) University of Bielefeld, Bielefeld, Germany;(2) Max-Planck Institute for Human Cognitive and Brain Sciences, Munich, Germany;(3) Department of Psychology, Pennsylvania State University, University Park, PA 16802, USA |
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Abstract: | Despite the great amount of research that has been done regarding the time it takes to move the hand to targets of varying
distances and widths, it is unclear whether target distance and width are both represented in movement plans prior to movement
initiation. We addressed this question by studying performance in an object manipulation task. Our participants reached out
and took hold of a familiar object (a bathroom plunger) to move it to wide or narrow targets of varying heights. Grasp heights
on the plunger were additively affected by target height and target width, suggesting that both factors were taken into account
by participants prior to moving the plunger from its initial position. Another factor we manipulated was the width of the
base from which the plunger was lifted on its way to its next position. This factor also affected grasp heights, but no more
so than target widths. The latter result contradicts the view that movement starts are planned in more detail than movement
ends, as might be expected from the fact that movement starts come sooner. Together, our results suggest that forthcoming
movements are planned in considerable detail. A surprising methodological implication of this study is that recording how
people prepare to move can reveal as much—or in some cases more—about what they have planned than can recording their subsequent
movements. |
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