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Related Experiment Videos

The coordination patterns observed when two hands reach-to-grasp separate objects.

Geoffrey P Bingham1, Kirstie Hughes, Mark Mon-Williams

  • 1Department of Psychology, Indiana University, Bloomington, IN 47405, USA.

Experimental Brain Research
|September 4, 2007
PubMed
Summary
This summary is machine-generated.

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Bimanual coordination typically prefers synchronous timing. However, this study found that visual information requirements lead to asynchronous timing, even when reaching for equidistant targets.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Bimanual coordination often favors synchronous timing for stability.
  • Unimanual reaching to unequal targets typically results in asynchronous movements.
  • Visual search strategies can influence movement timing.

Purpose of the Study:

  • To investigate the factors determining coordinative timing in bimanual reaching tasks.
  • To determine if preferred synchronous timing overrides unimanual constraints or visual demands.
  • To analyze the interplay between hand-object interactions and visual information gathering.

Main Methods:

  • Participants (n=8) performed bimanual reaching tasks to separate objects with varying widths and distances.
  • Movement analysis included an initial component (reaching and grip formation) and a completion component (grasping).

Related Experiment Videos

  • Kinematic data were analyzed to assess timing patterns and synchronization between limbs.

    • Main Results:

    • Both hands initiated the initial component (IC) synchronously.
    • Evidence of synchronization emerged during the deceleration phase of the IC.
    • Asynchronous timing persisted at the end of the IC and throughout the completion component (CC), even for equidistant targets.

    Conclusions:

    • Despite a preference for synchronous bimanual coordination, unimanual task constraints and visual information needs dictate asynchronous timing.
    • Visual requirements ultimately override the tendency for synchrony in complex reaching tasks.
    • Coordinative timing in bimanual actions is a complex interplay of motor programming and sensory feedback.