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Gaze direction influences grasping actions towards unseen, haptically explored, objects.

Martina Pirruccio1, Simona Monaco2, Chiara Della Libera1

  • 1Department of Neurosciences, Biomedicine and Movement Sciences, University of Verona, 37134, Verona, Italy.

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Haptic exploration creates mental object images stored in the early visual cortex (EVC). Eye position influences grasping of these unseen objects, suggesting shared resources between haptic and visual systems.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Sensory Integration

Background:

  • Haptic exploration generates mental object representations for future actions.
  • Haptically-acquired object images (HOIs) involve early visual cortex (EVC), but its causal role is unclear.
  • Grasping relies on visual information, requiring frame of reference shifts with eye position.

Purpose of the Study:

  • To investigate the causal role of the early visual cortex (EVC) in haptically-acquired object representation.
  • To determine if motor control of grasping haptic objects depends on eye position.
  • To explore potential resource sharing between haptic and visual/oculomotor systems.

Main Methods:

  • Measured 4-finger kinematics in 15 participants grasping unseen, previously haptically explored objects.
  • Manipulated participants' gaze direction (3 positions) while object position remained fixed.
  • Conducted a control experiment with intransitive hand movements to assess gaze modulation.

Main Results:

  • Finger kinematics during reaching for unseen objects significantly varied with gaze position.
  • Gaze direction modulated grasping movements, indicating an eye-centered frame of reference influence.
  • Intransitive hand movements were not affected by gaze direction, confirming task specificity.

Conclusions:

  • The motor system appears to use haptically acquired object information coded in an eye-centered frame of reference within the visual cortex.
  • Eye position influences haptic grasping, even without visual input, suggesting shared neural resources.
  • This indicates integration between haptic and visual/oculomotor systems for object-directed actions.