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Prehension movements and perceived object depth structure

U Castiello1, C Bonfiglioli, K Bennett

  • 1Department of Psychology, School of Behavioral Science, Faculty of Medicine, University of Melbourne, Parkville, VIC, Australia. u.castiello@psych.unimelb.edu.au

Perception & Psychophysics
|June 18, 1998
PubMed
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Motor patterns for grasping objects change based on real-time perception of their dimensions. How we see an object, as two-dimensional (2-D) or three-dimensional (3-D), influences our reach and grasp movements.

Area of Science:

  • Cognitive Neuroscience
  • Motor Control
  • Perception

Background:

  • Human motor behavior is influenced by object properties.
  • Perceptual information guides action selection and execution.

Purpose of the Study:

  • To investigate if motor patterns differ when an object's perceived dimension (2-D vs. 3-D) changes during a reach-and-grasp task.
  • To determine if real-time perceptual shifts can override existing object representations.

Main Methods:

  • Participants reached and grasped an apple presented as either 2-D or 3-D.
  • Experimental conditions involved sudden shifts in perceived dimension (2-D to 3-D, or 3-D to 2-D) at movement onset.
  • Control trials involved consistent 2-D or 3-D perception for comparison.

Related Experiment Videos

Main Results:

  • Grasping patterns adapted to the perceived dimension, with shifts from 2-D precision grips to 3-D whole-hand prehension and vice-versa.
  • Peak acceleration was observed when transitioning from 2-D to 3-D perception.
  • Motor patterns were modulated by real-time visual perception of object dimension.

Conclusions:

  • The way an object is perceived in real-time significantly influences motor patterns for interaction.
  • Object affordances, such as perceived dimensionality, can override pre-existing mental representations during action planning.