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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
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.
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).
- 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.
