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Related Experiment Videos

Transitions between two different motor patterns in Xenopus embryos

C S Green1, S R Soffe

  • 1School of Biological Sciences, University of Bristol, UK.

Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|February 1, 1996
PubMed
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This study reveals that the switch between struggling and swimming behaviors in Xenopus embryos involves gradual, centrally programmed changes in motor patterns. These transitions suggest a unified or closely linked neural mechanism controls both behaviors.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Biophysics

Background:

  • Vertebrate motor pattern switching mechanisms are poorly understood.
  • The Xenopus embryo offers a valuable model for studying these mechanisms.

Purpose of the Study:

  • To describe the kinematic and electrophysiological changes during the switch from struggling to swimming in Xenopus embryos.
  • To investigate the underlying neural control of motor pattern transitions.

Main Methods:

  • Combined kinematic analysis of movement.
  • Electrophysiological recordings of motor patterns in immobilized embryos.
  • Analysis of parameters like cycle period, bending strength, and longitudinal delay.

Main Results:

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  • Transitions from struggling to swimming involve progressive decreases in cycle period and bending strength, and reversal of longitudinal delay.
  • These kinematic changes correlate with similar alterations in the motor pattern of immobilized embryos.
  • Movement parameters and their motor pattern correlates scale together during transitions.

Conclusions:

  • Motor pattern transitions in Xenopus embryos are gradual and centrally programmed.
  • Transitional movements form a continuum with struggling movements.
  • A single or closely linked neural mechanism likely underlies the switch between struggling and swimming.