TY  - GEN
ID  - cogprints66
UR  - http://cogprints.org/66/
A1  - Smeets, Jeroen B.J.
A1  - Brenner, Eli
TI  - A new view on grasping
Y1  - 1999///
N2  - Reaching out for an object is often described as consisting of two components that are based on different visual information. Information about the object’s position and orientation guides the hand to the object, while information about the object’s shape and size determines how the fingers move relative to the thumb to grasp it. We propose an alternative description, which consists of determining suitable positions on the object — on the basis of its shape, surface roughness, and so on — and then moving one’s thumb and fingers more or less independently to these positions. We modelled this description using a minimum jerk approach, whereby the finger and thumb approach their respective target positions approximately orthogonally to the surface. Our model predicts how experimental variables such as object size, movement speed, fragility, and required accuracy will influence the timing and size of the maximum aperture of the hand. An extensive review of experimental studies on grasping showed that the predicted influences correspond to human behaviour.
AV  - public
KW  - finger movement
KW  -  grasping
KW  -  grip
KW  -  size
KW  -  orientation
KW  -  arm movement
KW  -  kinematics
KW  -  minimum jerk model
KW  -  motor control
KW  -  prehension
KW  -  transport
KW  -  visuomotor co-ordination.
ER  -

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