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Related Experiment Videos

Adaptive control for insect leg position: controller properties depend on substrate compliance.

H Cruse1, S Kühn, S Park

  • 1Faculty of Biology, University of Bielefeld, Postfach 100131, 33501 Bielefeld, Germany. holk.cruse@uni-bielefeld.de

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
|September 21, 2004
PubMed
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Stick insects adjust leg control based on surface stiffness. A compliant surface elicits a strong corrective response, while a stiff surface leads to position changes proportional to applied force.

Area of Science:

  • Biomechanics
  • Insect Locomotion
  • Neuroethology

Background:

  • The control of insect leg joints, specifically the femur-tibia joint in Carausius morosus, has been previously attributed to a combination of proportional and differential control mechanisms.
  • The prominent role of the differential component in this control system has been a subject of earlier research.

Purpose of the Study:

  • To investigate the control strategies employed by stick insect legs in response to perturbations of varying compliance.
  • To elucidate the roles of specific leg sense organs in mediating compensatory responses.
  • To re-evaluate the interpretation of the 'differential controller' in insect leg control.

Main Methods:

  • Systematic perturbation of single stick insect legs using devices of different compliance (soft and stiff springs).

Related Experiment Videos

  • Monitoring of compensatory forces and movements generated by the leg.
  • Selective ablation of leg sense organs, including femoral chordotonal organs and campaniform sensilla, to assess their contribution to control.

    • Main Results:

    • High compliance (soft spring) elicited forces that largely restored the leg to its original position.
    • Low compliance (stiff spring) resulted in sustained positional changes proportional to applied force.
    • Ablation of afferents from the femoral chordotonal organ abolished the leg's ability to maintain position.
    • Ablation of campaniform sensilla had no significant effect on leg positioning.

    Conclusions:

    • Stick insect leg control strategies adapt based on substrate compliance.
    • The previously identified 'differential controller' may function as an integral controller, adapting its response based on the correlation between motor output and leg movement.
    • The femoral chordotonal organ plays a crucial role in position maintenance, particularly under compliant conditions.