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Left visual field preference for a bimanual grasping task with ecologically valid object sizes.

Ada Le1, Matthias Niemeier

  • 1Department of Psychology, University of Toronto Scarborough, 1265 Military Trail, Toronto, ON, M1C1A4, Canada.

Experimental Brain Research
|July 17, 2013
PubMed
Summary
This summary is machine-generated.

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Bimanual grasping, using both hands, is primarily controlled by the right hemisphere, even for large objects. This right hemisphere dominance in motor control is consistent across different object sizes.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human-Computer Interaction

Background:

  • Bimanual grasping mechanisms are not fully understood, despite its evolutionary precedence over single-hand grasping.
  • Previous research suggested right hemisphere dominance for bimanual grasping, but only with small objects typically grasped by one hand.

Purpose of the Study:

  • To investigate whether the observed right hemisphere dominance in bimanual grasping extends to larger, more ecologically relevant objects.
  • To determine if object size influences the neural control of bimanual grasping.

Main Methods:

  • Participants fixated to the left or right of an object.
  • Participants grasped the object using the index and middle fingers of both hands.
  • Grip aperture and variability were measured to assess grasping efficiency.

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Main Results:

  • Bimanual grasping in the left visual field (processed by the right hemisphere) showed grip apertures scaled closer to object width.
  • Grasping in the left visual field resulted in smaller and less variable grip apertures compared to the right visual field.
  • These findings held true even when participants grasped larger objects.

Conclusions:

  • The right hemisphere predominantly controls bimanual grasping, irrespective of object size.
  • This suggests a robust neural specialization for coordinating two-handed actions, even for larger items.