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Related Experiment Videos

Temperature-sensitive gating in a descending visual interneuron, DCMD.

Tomas G A Money1, Correne A DeCarlo, R Meldrum Robertson

  • 1Department of Biology, Queen's University, Kingston, ON, Canada K7L 3N6.

Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
|May 6, 2006
PubMed
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Prior heat exposure (heat shock, HS) maintains locust descending contralateral movement detector (DCMD) neuron activity at high temperatures. This neuroplasticity involves direct thermal effects on visual circuits and indirect feedback mechanisms.

Area of Science:

  • Neuroscience
  • Animal Behavior
  • Sensory Physiology

Background:

  • Neural circuit activity is adaptable through experience.
  • Locust descending contralateral movement detector (DCMD) neuron responses are temperature-sensitive.
  • Prior heat shock (HS) exposure mitigates high-temperature effects on DCMD activity.

Purpose of the Study:

  • Investigate mechanisms underlying HS-induced plasticity in the DCMD.
  • Differentiate direct thermal effects from indirect feedback in DCMD thermosensitivity.
  • Understand temperature regulation of visually-guided behaviors.

Main Methods:

  • Elicited DCMD activity using computer-generated looming images.
  • Recorded extracellular DCMD responses.
  • Manipulated brain and thoracic temperatures during experiments.

Related Experiment Videos

  • Assessed DCMD thermosensitivity after severing thoracic nerve cord.

    • Main Results:

    • Maintaining brain temperature at 25°C during thoracic warming eliminated HS-induced high-frequency activity in DCMD.
    • Severing ascending input via thoracic nerve cord reduced DCMD thermosensitivity.
    • HS-induced plasticity involves both direct thermal effects on visual processing and indirect feedback.

    Conclusions:

    • Direct temperature effects on visual processing circuits contribute to HS-induced DCMD plasticity.
    • Indirect feedback mechanisms also play a role in modulating DCMD responses to temperature.
    • Thermosensitive feedback in locusts is crucial for regulating visually-guided behaviors.