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Related Experiment Videos

Neuronal activity during spontaneous walking--II. Correlation with stepping.

J Kien1

  • 1Fachbereich für Biologie, Universität Regensburg, F.R.G.

Comparative Biochemistry and Physiology. A, Comparative Physiology
|January 1, 1990
PubMed
Summary

Locust brain descending interneurons (DINs) show varied activity during walking. Most suboesophageal ganglion (SOG) DINs exhibit temporally patterned firing, some linked to specific leg movements.

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Area of Science:

  • Neuroscience
  • Locust locomotion
  • Motor control

Background:

  • Descending interneurons (DINs) in the locust brain play a crucial role in motor control.
  • The suboesophageal ganglion (SOG) is a key integration center for sensory and motor information.
  • Understanding neural activity patterns during locomotion is essential for deciphering motor control mechanisms.

Purpose of the Study:

  • To investigate the activity patterns of DINs and SOG neurons during locust walking.
  • To determine the relationship between neuronal firing and the stepping cycle.
  • To identify specific motor correlates of neuronal activity.

Main Methods:

  • Electrophysiological recordings were performed on locusts during walking.
  • Neuronal activity of DINs and SOG neurons was monitored.

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  • Temporal firing patterns were analyzed in relation to the stepping cycle.

    • Main Results:

    • Most active DINs fired tonically, while most SOG DINs showed temporally patterned activity.
    • In over half of the recorded neurons, temporal firing did not correlate with the stepping cycle.
    • In the remaining neurons, firing correlated with specific phases of the step cycle, termed "motor fields".

    Conclusions:

    • Locust walking involves diverse firing patterns in brain and SOG descending interneurons.
    • A subset of SOG DINs exhibit temporally patterned activity linked to specific motor functions.
    • These "motor fields" can encompass functions of single or multiple legs, suggesting complex motor integration.