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Distractor interference during a choice limb reaching task.

Matthew Ray1, Daniel Weeks2, Timothy N Welsh3

  • 1Faculty of Kinesiology and Physical Education, University of Toronto, Toronto, Ontario, Canada.

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|January 28, 2014
PubMed
Summary
This summary is machine-generated.

Distractor interference in reaching tasks depends on response competition. When selecting between limbs, distractors on the opposite side (contralateral effect) caused more interference than those on the same side.

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Area of Science:

  • Cognitive Psychology
  • Neuroscience
  • Motor Control

Background:

  • Action-centered models explain distractor interference via competition between response processes.
  • Previous research on unimanual tasks showed ipsilateral effects, where same-limb distractors cause more interference.
  • The impact of inter-limb competition on distractor interference remained unaddressed.

Purpose of the Study:

  • To investigate distractor interference in bimanual reaching tasks.
  • To determine if a contralateral effect emerges when response selection involves competing limb responses.

Main Methods:

  • Participants performed reaching movements to one of four targets (left/right) with a distractor present or absent.
  • Ipsilateral reaches were executed (left hand to left targets, right hand to right targets).
  • Interference from same-hand versus opposite-hand distractors was compared.

Main Results:

  • A contralateral effect was observed, contrary to previous unimanual findings.
  • Distractors coded for the contralateral hand caused greater interference than same-hand distractors.
  • This suggests interference is greatest when distractors compete with pre-response planning dimensions.

Conclusions:

  • Response selection between limbs alters distractor interference patterns.
  • The contralateral effect highlights the role of inter-limb competition in reaching tasks.
  • Distractor interference is maximized when distractors share response planning dimensions with the target.