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Practice and assimilation effects in a multilimb aiming task.

D E Sherwood1

  • 1Department of Kinesiology, University of Colorado, Boulder, CO 80309-0354, USA.

Journal of Motor Behavior
|June 1, 1990
PubMed
Summary
This summary is machine-generated.

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Assimilation effects occur when limbs move different distances, with shorter limbs overshooting and longer limbs undershooting targets. Practice reduces these effects, especially between upper and lower limbs, suggesting less neural crosstalk than between left and right limbs.

Area of Science:

  • Neuroscience
  • Motor Control
  • Human Movement Science

Background:

  • Simultaneous limb movements can exhibit assimilation effects, where movements are biased towards each other.
  • Understanding practice effects on these assimilation phenomena is crucial for motor learning theories.

Purpose of the Study:

  • To investigate the impact of practice on assimilation effects in a simultaneous four-limb aiming task.
  • To compare assimilation effects between limb pairs (left/right vs. upper/lower) and their modulation by practice.

Main Methods:

  • Two experiments utilized a simultaneous four-limb aiming task with differing movement distances for limb pairs.
  • Kinematic data (distance, errors) were analyzed across acquisition and transfer trials with and without knowledge of results (KR).

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Main Results:

  • Left/right limb differences showed persistent assimilation effects, reduced but not eliminated by practice.
  • Upper/lower limb differences showed initial assimilation that diminished with practice, absent in transfer trials.
  • Neural crosstalk appears greater between contra-lateral limbs (left/right) than ipsi-lateral limbs (upper/lower).

Conclusions:

  • Practice differentially affects assimilation based on limb pairing, indicating distinct neural control mechanisms.
  • The functional cerebral space model may explain observed differences in neural crosstalk between limb pairs during simultaneous movements.