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Bimanual coordination stability relies mainly on feedforward signal timing, not just sensory feedback. Integrated timing of feedforward signals predominantly determines in-phase versus antiphase coordination stability.

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Area of Science:

  • Motor control
  • Human movement science
  • Neuroscience

Background:

  • Bimanual coordination stability is influenced by three postulated interlimb interactions.
  • These interactions include integrated feedforward control, phase entrainment via contralateral afference, and error-based timing corrections.
  • The combined contribution of these factors to coordination stability remains unevaluated.

Purpose of the Study:

  • To discern the relative contributions of integrated feedforward timing, phase entrainment, and error correction to bimanual coordination stability.
  • To compare these contributions during active bimanual movements and kinesthetic tracking tasks.

Main Methods:

  • Systematic comparison of five tasks involving rhythmic wrist flexion-extension movements.
  • Tasks included bimanual (in-phase, antiphase) and unimanual active movements, with and without contralateral passive movements.
  • Electromyography (EMG) activity and movement phase were analyzed.

Main Results:

  • Contralateral passive movements induced phase entrainment to in-phase or antiphase patterns.
  • Entrainment strength increased with passive movement amplitude but was similar for both phasing patterns.
  • Afference-based error corrections modulated timing, being more pronounced in in-phase coordination.
  • In-phase coordination showed greater stability than antiphase coordination, primarily during active bimanual tasks.

Conclusions:

  • Phase entrainment by contralateral afference equally contributes to in-phase and antiphase coordination stability.
  • Differential stability between in-phase and antiphase coordination predominantly depends on integrated feedforward signal timing.
  • Afference-based error corrections play a minor role in differentiating coordination stability.