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Related Experiment Video

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Problems in planning bimanually incongruent grasp postures relate to simultaneous response specification processes.

Charmayne M L Hughes1, Christian Seegelke2, Paola Reissig3

  • 1Robotics Research Centre, School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore.

Brain and Cognition
|March 22, 2014
PubMed
Summary

Problems in planning grasp posture during bimanual incongruent movements stem from motor programming crosstalk. This interference lessens with longer stimulus onset asynchrony (SOA), suggesting multiple neurobiological-cognitive levels are involved.

Keywords:
Bimanual coordinationEnd-state comfortGrasping and placing

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Area of Science:

  • Neuroscience
  • Motor Control
  • Cognitive Psychology

Background:

  • Bimanual movements often present challenges in grasp posture planning.
  • Understanding the source of interference in simultaneous, non-identical movements is crucial.

Purpose of the Study:

  • To investigate if motor programming crosstalk causes difficulties in grasp posture planning during incongruent bimanual actions.
  • To determine the role of stimulus onset asynchrony (SOA) in bimanual interference.

Main Methods:

  • Participants performed a grasp and place task with congruent and incongruent object rotations.
  • Stimulus onset asynchrony (SOA) between the two objects was systematically varied.

Main Results:

  • Difficulties in bimanual incongruent grasp posture planning decreased significantly at SOAs over 1000ms.
  • Congruent conditions showed shorter reach-to-grasp times and higher interlimb coupling than incongruent conditions.
  • Bimanual interference appears to stem from motor programming crosstalk, visual motor limitations, or conceptual language representations.

Conclusions:

  • Bimanual interference in grasp posture planning is reduced with longer SOAs, supporting the motor programming crosstalk hypothesis.
  • Interference effects arise from constraints acting at multiple levels of the neurobiological-cognitive system.
  • Findings highlight the complex interplay between motor programming, visual-motor systems, and conceptual representations in bimanual coordination.