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Reference frames in the decisions of hand choice.

Romy S Bakker1, Luc P J Selen1, W Pieter Medendorp1

  • 1Donders Institute for Brain, Cognition and Behaviour, Radboud University Nijmegen , Nijmegen , The Netherlands.

Journal of Neurophysiology
|February 15, 2018
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Summary

The brain uses both head and gaze directions to decide which hand to use for reaching. This study reveals how these spatial reference frames influence hand choice, alongside body-centered factors.

Keywords:
decisionseffector selectionpsychophysicsreachingreference frames

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Area of Science:

  • Neuroscience
  • Human motor control
  • Cognitive psychology

Background:

  • Hand selection for reaching movements is influenced by body-centered factors like movement costs and handedness.
  • The spatial reference frames guiding hand choice, particularly head- and gaze-centered frames, remain poorly understood.
  • Understanding these reference frames is crucial for comprehending the neural basis of reaching decisions.

Purpose of the Study:

  • To investigate the role of head- and gaze-centered reference frames in the spatial aspects of hand selection.
  • To determine how different orientations of the head and gaze affect the choice between left and right hands for reaching.

Main Methods:

  • Nineteen right-handed subjects performed unimanual reaching movements to targets in various directions.
  • Head and gaze orientations were manipulated independently while subjects made hand choices.
  • An adaptive procedure identified the target angle that resulted in equal probability of choosing either hand.

Main Results:

  • When gaze was fixed relative to the body, the hand choice balance point shifted with head orientation.
  • When head orientation was fixed, the hand choice balance point shifted with gaze direction.
  • These findings indicate a combined influence of head- and gaze-centered reference frames on hand selection.

Conclusions:

  • Spatial decisions for hand choice integrate information from both head- and gaze-centered reference frames.
  • This integration likely supports flexible binding of hand selection with target selection mechanisms.
  • The findings expand our understanding of the complex spatial computations underlying human reaching movements.