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Behavioural state affects motion-sensitive neurones in the fly visual system.

R Rosner1, M Egelhaaf, A-K Warzecha

  • 1Lehrstuhl für Neurobiologie, Universität Bielefeld, Bielefeld, Germany. rosner@staff.uni-marburg.de

The Journal of Experimental Biology
|December 30, 2009
PubMed
Summary

Animal internal states modulate sensory processing. This study shows that lobula plate tangential cells (LPTCs) in flies enhance responses during motor activity, but this doesn't fully explain behavioral gain changes.

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Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Processing

Background:

  • Neuronal and behavioral responses are influenced by an animal's internal state.
  • Gain changes in sensory pathways can occur at multiple processing levels.
  • Motion-sensitive lobula plate tangential cells (LPTCs) are crucial for visual-motor behaviors like head optomotor responses.

Purpose of the Study:

  • To investigate how information processing in LPTCs changes with different motor activity states in blowflies.
  • To determine if LPTC response modulation explains observed changes in head optomotor response amplitude.

Main Methods:

  • Studied motion-sensitive lobula plate tangential cells (LPTCs) in blowflies.
  • Differentiated motor activity states based on haltere oscillation (hindwing movements during walking or flying).

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  • Recorded LPTC responses under different motor activity conditions.

    • Main Results:

    • LPTC responses were enhanced when halteres oscillated, indicating dependence on motor activity.
    • The observed enhancement in LPTC responses did not fully account for the larger gain changes in head movements.
    • Haltere activity alone did not alter LPTC activity levels.

    Conclusions:

    • A central signal associated with motor activity, rather than direct haltere input, likely modulates LPTC gain.
    • This central signal influences both the gain of head optomotor responses and LPTC response properties.
    • Internal state-dependent modulation of sensory pathways plays a complex role in behavioral control.