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A cross-modal interference effect in grasping objects.

Sandhiran Patchay1, Umberto Castiello, Patrick Haggard

  • 1Royal Holloway University of London, Egham, England. s.patchay@gre.ac.uk

Psychonomic Bulletin & Review
|March 6, 2004
PubMed
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Haptic and proprioceptive input from an actively grasped distractor influences hand reaching kinematics. Grasping an unseen distractor affects movement, especially when its size differs from the visual target.

Area of Science:

  • Neuroscience
  • Human Motor Control
  • Sensory Integration

Background:

  • Understanding how sensory information influences motor control is crucial.
  • The role of haptic and proprioceptive feedback in modulating reaching movements requires further investigation.

Purpose of the Study:

  • To investigate the influence of haptic and proprioceptive input from an unseen distractor on hand reaching kinematics.
  • To determine the impact of distractor size and active grasping on motor interference.

Main Methods:

  • Participants reached for a visual target with one hand while actively grasping an unseen distractor with the other.
  • Grip aperture and time to maximum grip aperture were measured.
  • A vibrating distractor condition was used to assess passive tactile input.

Related Experiment Videos

Main Results:

  • Smaller distractor size led to reduced maximum grip aperture and earlier time to maximum grip aperture.
  • Interference effects were comparable between the reaching and nonreaching hands.
  • Interference effects were observed only when the distractor was actively grasped, not with passive tactile input.

Conclusions:

  • Neural processing of proprioceptive and tactile information related to distractor size underlies observed interference effects.
  • Active manipulation of a distractor stimulus is critical for eliciting motor interference during reaching tasks.