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On the relation between nontarget object location and avoidance responses.

Rudmer Menger1, H Chris Dijkerman1, Stefan Van der Stigchel1

  • 1Experimental Psychology, Helmholtz Institute, Utrecht University, Utrecht, The Netherlands.

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|March 12, 2015
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Summary
This summary is machine-generated.

Nontarget objects significantly alter reaching movements, with avoidance responses intensifying as nontargets get closer. This study precisely maps these avoidance behaviors across the workspace, revealing specific "hot" zones that elicit the strongest motor responses.

Keywords:
goal-directed movementmotor controlperception and action

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Area of Science:

  • Motor Control
  • Human Movement Science
  • Cognitive Neuroscience

Background:

  • Nontarget objects influence reach kinematics.
  • Previous studies indicate increased avoidance with decreased nontarget distance.
  • Asymmetrical responses exist for equidistant internal and external nontargets.

Purpose of the Study:

  • To systematically map avoidance responses across the workspace.
  • To detail the relationship between nontarget position and avoidance.
  • To investigate the influence of horizontal/vertical position, distance, and angle on reaching behavior.

Main Methods:

  • Participants performed reaches toward targets with 24 different nontarget positions.
  • Kinematic parameters of reaching movements were analyzed.
  • The study systematically varied nontarget location in the workspace.

Main Results:

  • Replication of horizontal and vertical nontarget effects on reaching.
  • Stronger avoidance of external compared to internal nontargets confirmed.
  • Identification of a "hot" region of nontarget positions eliciting maximal avoidance.

Conclusions:

  • Motor representations exhibit fine-grained spatial resolution for nontargets.
  • Nontarget position critically modulates reaching kinematics.
  • Detailed mapping clarifies the influence of nontargets on motor planning.