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Nothing magical: pantomimed grasping is controlled by the ventral system.

Thijs Rinsma1, John van der Kamp2,3, Matt Dicks4

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Summary

Actions require tactile contact to engage the dorsal visual system. Without this contact, like in pantomime grasping, the ventral system takes over, showing reliance on allocentric information and susceptibility to visual illusions.

Keywords:
Allocentric informationGraspingPantomimeTwo-visual systemsVisual illusion

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Motor Control

Background:

  • The two-visual-system model posits distinct pathways for perception and action.
  • A recent amendment suggests tactile contact is crucial for dorsal system engagement.
  • The role of allocentric information in action control, particularly during pantomime, requires further investigation.

Purpose of the Study:

  • To test the hypothesis that tactile contact is necessary for dorsal system engagement.
  • To examine the use of allocentric information in normal versus pantomime grasping actions.
  • To determine if visual illusions influence grasping behavior differently based on tactile feedback.

Main Methods:

  • Participants (inexperienced and magicians) performed normal and pantomime grasps towards objects within the Müller-Lyer illusion.
  • Pantomime grasps were executed next to, but without touching, the target object (displaced pantomime grasping).
  • Grasp parameters (duration, speed, aperture) and susceptibility to the illusion were analyzed.

Main Results:

  • Pantomime grasps were slower, took longer, and had smaller apertures than normal grasps.
  • The Müller-Lyer illusion significantly affected hand apertures during pantomime grasping but not normal grasping.
  • This effect persisted in both inexperienced participants and experienced magicians.

Conclusions:

  • Displaced pantomime grasping relies on allocentric information, supporting the tactile contact hypothesis for dorsal system engagement.
  • The findings suggest that when tactile contact is absent, motor control shifts to the ventral system.
  • Experience in pantomime does not eliminate the reliance on allocentric information when tactile feedback is missing.