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The spatial alignment effect in near and far space: a kinematic study.

Elisa De Stefani1, Alessandro Innocenti, Doriana De Marco

  • 1Department of Neuroscience, University of Parma, Via Volturno 39, 43100, Parma, Italy.

Experimental Brain Research
|April 22, 2014
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Summary
This summary is machine-generated.

The spatial alignment effect influences pantomimed grasping, especially for near objects. Object distance affects movement parameters, even within peripersonal space, indicating affordance instantiation during reach-to-grasp actions.

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Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • The spatial alignment effect describes how object orientation influences grasp planning.
  • Understanding how object properties and distance affect motor control in pantomimed actions is crucial.

Purpose of the Study:

  • To investigate if the spatial alignment effect modulates kinematic parameters during pantomimed reaching and grasping.
  • To examine the influence of object distance (reachable vs. not reachable) and handle orientation (congruent vs. incongruent) on pantomimed grasp.

Main Methods:

  • Participants performed pantomimed reach-to-grasp movements towards cups with varying handle orientations and distances.
  • Kinematic parameters, including maximal finger aperture and temporal movement characteristics, were analyzed.

Main Results:

  • Incongruent handle orientation increased maximal finger aperture for near objects, suggesting the spatial alignment effect is distance-dependent.
  • Object distance significantly affected temporal parameters and movement amplitudes, irrespective of actual reachability.
  • Affordance instantiation, including the spatial alignment effect, occurred when objects were within reach.

Conclusions:

  • The spatial alignment effect impacts pantomimed grasping, particularly for near objects, influenced by object properties and distance.
  • Object distance modulates motor control parameters in pantomimed actions, independent of reachability.
  • Affordance is dynamically instantiated during action planning, influenced by both intrinsic and extrinsic object properties.