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Related Experiment Videos

Dual sensory-motor function for a molluskan statocyst network.

R Levi1, P Varona, Y I Arshavsky

  • 1Institute for Nonlinear Science, University of California San Diego, La Jolla, California 92093-0402, USA. rlevi@ucsd.edu

Journal of Neurophysiology
|September 26, 2003
PubMed
Summary

Statocysts in marine mollusks are crucial for hunting. These sensory organs, statocyst receptor cells (SRCs), actively generate the motor program for complex search movements during hunting behavior.

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Area of Science:

  • Neuroscience
  • Marine Biology
  • Behavioral Ecology

Background:

  • Statocyst receptor cells (SRCs) in mollusks form neural networks.
  • SRCs respond to gravity and multimodal inputs, suggesting functions beyond orientation sensing.
  • Hunting behavior in Clione limacina involves complex search trajectories.

Purpose of the Study:

  • To investigate the role of statocysts in organizing search motion during hunting behavior in Clione limacina.
  • To determine if statocysts are necessary for generating the motor program underlying search movements.
  • To explore the intrinsic dynamics of the statocyst network in motor program generation.

Main Methods:

  • Pharmacological induction of "fictive search behavior" using physostigmine on isolated central nervous system (CNS).

Related Experiment Videos

  • Behavioral experiments involving the removal of statocysts.
  • In vitro electrophysiological recordings from single SRCs and motor nerves.
  • Development of a biologically based computational model.

    • Main Results:

    • Statocysts were found to be necessary for search behavior; its removal prevented the production of the typical searching motor program.
    • A correlation was observed between SRC activity and search episodes, even with constant sensory stimuli.
    • Individual SRC excitation could precede search episodes, suggesting an active role in initiation.
    • A computational model demonstrated that the statocyst network's intrinsic dynamics can theoretically generate the search motor program.

    Conclusions:

    • Statocysts are actively involved in the production of the motor program for search movements during hunting behavior.
    • The statocyst network possesses intrinsic properties that can generate complex motor patterns.
    • The findings expand the known functions of statocysts beyond simple orientation sensing.