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A Rapid Tactile-Motor Reflex Automatically Guides Reaching toward Handheld Objects.

J Andrew Pruszynski1, Roland S Johansson2, J Randall Flanagan3

  • 1Department of Physiology and Pharmacology, Department of Psychology, Robarts Research Institute, Brain and Mind Institute, Western University, London, ON N6A 5B7, Canada; Department of Integrative Medical Biology, Umea University, 901 87 Umeå, Sweden.

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Summary

Tactile input from one hand can trigger rapid, automatic reach corrections in the other hand when a target object moves unexpectedly. This demonstrates a tactile-motor reflex supporting skilled manipulation.

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Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Skilled actions require rapid responses to changes in object location.
  • Previous research focused on visual cues for automatic reach corrections.
  • Object manipulation often involves tactile information about target position.

Purpose of the Study:

  • To investigate if tactile information alone can trigger automatic reach corrections.
  • To explore the existence of a tactile-motor reflex in inter-manual interactions.
  • To determine if automatic reach corrections are exclusive to visual stimuli.

Main Methods:

  • Participants reached with their right hand to a target on a rod.
  • The rod's near end was contacted by the left hand.
  • Target location changed unexpectedly due to rod rotation, providing tactile input.

Main Results:

  • An unexpected change in target location rapidly evoked effective reach corrections.
  • Tactile inputs to one hand elicited trajectory corrections in the other hand.
  • Automatic reach corrections were demonstrated using only tactile spatial information.

Conclusions:

  • A tactile-motor reflex exists that supports object manipulation.
  • Automatic reach corrections are not solely dependent on visual information.
  • Touch plays a crucial role in real-time motor adjustments during complex tasks.