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Object motor representation and reaching-grasping control.

Maurizio Gentilucci1

  • 1Istituto di Fisiologia Umana, Via Volturno 39, I-43100 Parma, Italy. gentiluc@unipr.it

Neuropsychologia
|April 5, 2002
PubMed
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Grasp is guided by a single object representation coding all affordances, not multiple representations. Object volume, shape, and familiarity influence grasp, even when the grasped part is identical.

Area of Science:

  • Motor control
  • Human-computer interaction
  • Cognitive neuroscience

Background:

  • The study investigates how the brain plans and executes grasping actions.
  • It addresses two competing hypotheses regarding object representation during grasp: multiple representations versus a single, affordance-rich representation.

Purpose of the Study:

  • To determine whether grasp is guided by multiple object representations or a single representation encoding all affordances.
  • To examine the influence of object properties (volume, shape, familiarity, weight, center of mass) on grasp kinematics.

Main Methods:

  • Participants reached for and grasped various objects (fruits, geometric solids, bells) with identical graspable parts but differing overall properties.
  • Grasp kinematics (movement patterns) were recorded and analyzed.

Related Experiment Videos

Main Results:

  • Object volume, shape, and familiarity significantly influenced grasp kinematics, irrespective of the identical graspable part.
  • Object height and weight affected reach kinematics, while center of mass did not impact either reach or grasp.
  • Control experiment confirmed findings with objects of identical shape but varying size.

Conclusions:

  • The findings support the hypothesis of a single object motor representation that encompasses all object affordances.
  • This representation guides grasp kinematic implementation, integrating information about the object's overall properties.