AI Article Synopsis

  • Researchers studied how changes in object texture influenced the way people reach to grasp items, focusing on whether these changes lead to different movement patterns.
  • In the experiment, participants lifted objects with varying grip surface textures (high, medium, and low friction) and widths at different distances, resulting in 27 unique trial conditions.
  • The findings indicated that high-friction surfaces led to more 'on-the-fly' grasps while low-friction surfaces resulted in stopping to secure the object, suggesting that surface texture significantly affects grasping behavior by altering the functional grasp surface size.

Article Abstract

Reach-to-grasp movements change quantitatively in a lawful (i.e. predictable) manner with changes in object properties. We explored whether altering object texture would produce qualitative changes in the form of the precontact movement patterns. Twelve participants reached to lift objects from a tabletop. Nine objects were produced, each with one of three grip surface textures (high-friction, medium-friction and low-friction) and one of three widths (50 mm, 70 mm and 90 mm). Each object was placed at three distances (100 mm, 300 mm and 500 mm), representing a total of 27 trial conditions. We observed two distinct movement patterns across all trials--participants either: (i) brought their arm to a stop, secured the object and lifted it from the tabletop; or (ii) grasped the object 'on-the-fly', so it was secured in the hand while the arm was moving. A majority of grasps were on-the-fly when the texture was high-friction and none when the object was low-friction, with medium-friction producing an intermediate proportion. Previous research has shown that the probability of on-the-fly behaviour is a function of grasp surface accuracy constraints. A finger friction rig was used to calculate the coefficients of friction for the objects and these calculations showed that the area available for a stable grasp (the 'functional grasp surface size') increased with surface friction coefficient. Thus, knowledge of functional grasp surface size is required to predict the probability of observing a given qualitative form of grasping in human prehensile behaviour.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3293844PMC
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0032770PLOS

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