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Behavioral testing and preliminary analysis of the hamster visual system.

G E Schneider1, R G Ellis-Behnke, Y X Liang

  • 1Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA.

Nature Protocols
|May 10, 2007
PubMed
Summary

This study uses hamster visual orienting behavior to model central nervous system regeneration. Hamsters turn towards visual stimuli, providing a method to assess axonal pathway recovery over several months.

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Area of Science:

  • Neuroscience
  • Regenerative Medicine
  • Animal Behavior

Background:

  • Visual orienting ability in hamsters depends on retinal projections to the midbrain tectum.
  • This pathway serves as a model for assessing central nervous system axonal regeneration.

Purpose of the Study:

  • To establish a reliable behavioral model for evaluating functional regeneration of the retina-to-midbrain tectum axonal pathway.
  • To detail the methodology for assessing visual orienting behavior in hamsters.

Main Methods:

  • Utilized adult male hamsters (10-12 weeks old) with regular pretesting.
  • Visual stimuli (sunflower seed on a ball) presented to assess turning movements, avoiding whisker contact.
  • Video recording from above, excluding the binocular visual field (nasal 30 degrees).

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  • Sessions included ten stimuli presentations per side, measuring response frequency and turning trajectories.

    • Main Results:

    • The study outlines a comprehensive protocol for assessing visual orienting behavior.
    • Complete functional recovery assessment requires 3-6 months of consistent testing.
    • Detailed turning trajectories and response frequency are key outcome measures.

    Conclusions:

    • The described visual orienting paradigm in hamsters is a viable model for studying central nervous system axonal regeneration.
    • The methodology allows for quantitative assessment of functional recovery in specific neural pathways.
    • Long-term observation is necessary for complete evaluation of behavioral regeneration.