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Related Experiment Videos

Adult motor patterns produced by moth pupae during development

A E Kammer, M B Rheuben

    The Journal of Experimental Biology
    |August 1, 1976
    PubMed
    Summary

    Developing moth pupae exhibit adult-like motor patterns, suggesting wing immobility isn't solely due to pupal confinement. These early patterns show developmental changes and species-specific traits.

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    Area of Science:

    • Neuroscience
    • Developmental Biology
    • Insect Physiology

    Background:

    • Insect motor patterns, particularly during development, are crucial for understanding neuromuscular control.
    • Previous research has focused on adult motor control, with less known about pre-emergent patterns.

    Purpose of the Study:

    • To investigate the development and characteristics of muscle motor patterns in developing moth pupae.
    • To compare pupal motor patterns with those of adult moths during flight and shivering.
    • To explore the influence of wing immobility on motor pattern development.

    Main Methods:

    • Extracellular recording of muscle potentials from developing pupae and adults of Antheraea polyphemus, A. pernyi, and Manduca sexta.
    • Chronic implantation of leads to observe motor pattern development over several days.
    • Experimental manipulation involving wing movement restriction in adult A. polyphemus.

    Main Results:

    • Developing pupae produced motor patterns resembling adult flight and shivering, but with longer cycle times and greater variability.
    • Motor activity increased in frequency and pattern complexity throughout pupal development.
    • Wing restraint in adults altered cycle time and spike bursts but not interspike intervals, similar to pharate moth patterns.

    Conclusions:

    • Pupal motor patterns share similarities with adult patterns, indicating a developmental progression.
    • Differences between pupal and adult motor patterns may not solely result from the physical confinement of wings within the pupal cuticle.
    • Species-specific differences in adult motor patterns are observable even during the pupal stage.

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