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Motor patterns during kicking movements in the locust
1Department of Zoology, University of Cambridge, UK.
Journal of Comparative Physiology. A, Sensory, Neural, and Behavioral Physiology
|March 1, 1995
Summary
Locust hind leg kicks utilize a unique motor pattern involving muscle co-contraction and release for powerful tibial extension. This neural control allows for adaptable movements, from slow and weak to rapid and strong, suiting the locust
Area of Science:
- Neuroscience
- Biomechanics
- Insect Motor Control
Background:
- Locusts (Schistocerca gregaria) exhibit a distinct motor pattern for rapid hind leg tibial extension.
- This powerful movement, or kick, is generated by muscle co-contraction and subsequent release, augmented by joint mechanics.
Purpose of the Study:
- To analyze motor neuron activity in locust hind leg muscles during kicking.
- To correlate motor neuron firing patterns with tibial movements and resultant forces.
Main Methods:
- Electrophysiological analysis of motor neuron activity in locust hind legs.
- Observation and measurement of tibial movements and forces during kicking.
Main Results:
- Motor neuron activity patterns during co-contraction and tibial extension were detailed.
- Variations in co-contraction duration and motor neuron spiking frequency directly influenced the speed and power of tibial extension.
- Evidence suggests both central and sensory feedback pathways contribute to motor control.
Conclusions:
- The locust kick's motor control is flexible, allowing a spectrum of movements.
- This neural network adaptability enables locusts to adjust their movements based on environmental demands.