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Related Experiment Videos

Proprioceptive input to feeding motor programs in Aplysia

C G Evans1, E C Cropper

  • 1Department of Physiology and Biophysics, The Mount Sinai Medical Center, New York, New York 10029, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|September 19, 1998
PubMed
Summary

The feeding neuron B51 in Aplysia acts as both a motor controller and a sensory receptor. This dual role allows Aplysia to adjust their feeding motor programs based on real-time feedback during food intake.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Physiology

Background:

  • Central pattern generators (CPGs) produce rhythmic motor activity.
  • Physiological conditions involve integrating external and internal environmental information into CPGs.
  • Invertebrate preparations offer advantages for studying cellular mechanisms of sensorimotor integration.

Purpose of the Study:

  • To investigate sensorimotor integration in the feeding circuitry of Aplysia.
  • To characterize the role of the premotor neuron B51 in ingestive motor programs.
  • To understand how sensory feedback influences motor output during feeding.

Main Methods:

  • Studied sensorimotor integration in semi-intact Aplysia preparations.
  • Manipulated the activity of the B51 neuron (depolarization and hyperpolarization).

Related Experiment Videos

  • Measured radula closing/retraction movements and B51 neural activity in response to altered resistance.

    • Main Results:

    • The premotor neuron B51 plays a key role in the radula closing/retraction phase of feeding.
    • Depolarizing B51 enhances radula closing/retractions; hyperpolarizing it reduces them.
    • B51 functions as a proprioceptor, increasing activity with increased resistance to radula rotation, indicating a feedback mechanism.

    Conclusions:

    • The neuron B51 integrates motor control and sensory feedback in Aplysia feeding.
    • Aplysia can adjust feeding motor programs based on food properties via B51's sensory function.
    • This study reveals a cellular mechanism for adapting motor programs to environmental challenges during feeding.