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Related Experiment Videos

Visual pathways for postural control and negative phototaxis in lamprey

F Ullén1, T G Deliagina, G N Orlovsky

  • 1Department of Neuroscience, Nobel Institute for Neurophysiology, Karolinska Institute, Stockholm, Sweden.

Journal of Neurophysiology
|August 1, 1997
PubMed
Summary

This study reveals how lamprey brains control movement using light cues. The contralateral pretectum is crucial for visual responses, with distinct pathways guiding turning and body tilting.

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Area of Science:

  • Neuroscience
  • Comparative Biology
  • Vision Research

Background:

  • The dorsal light response (DLR) and negative phototaxis (NP) are fundamental behaviors for orienting in aquatic environments.
  • Understanding the neural circuits underlying these visuo-motor responses is key to deciphering brain function.

Purpose of the Study:

  • To elucidate the functional roles of specific visuo-motor pathways in lamprey.
  • To determine the neural substrates responsible for the dorsal light response and negative phototaxis.

Main Methods:

  • Video-recording of lamprey responses to eye illumination in intact and lesioned animals.
  • Analysis of postural deficits during spontaneous swimming.
  • Targeted ablations and transections of brainstem and spinal cord pathways.

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Main Results:

  • Contralateral pretectum is essential for both DLR and NP; tectum ablation enhances these responses.
  • Crossed pretecto-reticular fibers are critical for DLR, while noncrossed fibers mediate NP.
  • Spinal cord pathways in lateral and medial columns are differentially involved in yaw and roll control.

Conclusions:

  • The contralateral optic nerve projection to the pretectal region is necessary and sufficient for DLR and NP.
  • Distinct descending pretectal pathways control DLR and NP.
  • Specific spinal cord tracts mediate lateral and roll movements.