2012
DOI: 10.1007/s00221-012-3288-0
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Why are the digits’ paths curved vertically in human grasping movements?

Abstract: When humans grasp an object off a table, their digits generally move higher than the line between their starting positions and the positions at which they end on the target object, so that the digits' paths are curved when viewed from the side. We hypothesized that this curvature is caused by limitations imposed by the environment. We distinguish between local constraints that act only at the very beginning or the very end of the movement, and global constraints that act during the movement. In order to find o… Show more

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Cited by 8 publications
(16 citation statements)
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References 24 publications
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“…It did so to an extent that is set by the parameter R t . In this study, we changed the value of R t to zero because we experimentally found that the table does not affect the vertical curvature, but that the curvature is mainly caused by local constraints at the start of the movement (Verheij et al 2013). In line with that finding, we added an upward 'force' of 4 m/s 2 to the force field if the tip was lower than 5 mm.…”
Section: Collision Avoidancementioning
confidence: 58%
“…It did so to an extent that is set by the parameter R t . In this study, we changed the value of R t to zero because we experimentally found that the table does not affect the vertical curvature, but that the curvature is mainly caused by local constraints at the start of the movement (Verheij et al 2013). In line with that finding, we added an upward 'force' of 4 m/s 2 to the force field if the tip was lower than 5 mm.…”
Section: Collision Avoidancementioning
confidence: 58%
“…In our previous study (Verheij et al, 2013) we labeled this component GT and developed a method to isolate it. In this method we considered the 'height' of the index finger's path as composed of three components: one caused by the local constraints at the start of the movement CS, one caused by the local constraints at the end of the movement CE, and one possibly caused by gravity GT.…”
Section: Discussionmentioning
confidence: 99%
“…We defined the start of the grasping movement as the first moment at which the velocity of the index finger exceeded 0.1 m/s (a value frequently used in grasping studies; e.g., Hesse, Nakagawa, & Deubel, 2010;Schot, Brenner, & Smeets, 2010;van de Kamp & Zaal, 2007;Verheij et al, 2013). The end of the grasping movement was defined as the first moment, after the start of the movement, at which the velocity of the index finger dropped below 0.1 m/s.…”
Section: Discussionmentioning
confidence: 99%
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