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Related Experiment Videos

The mouse light-dark paradigm: a review.

M Hascoët1, M Bourin, B A Nic Dhonnchadha

  • 1Faculty of Medicine, JE 2029 Neurobiologie de l'anxiété, Faculty de Médecine, Nantes, France.

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|March 27, 2001
PubMed
Summary

The black and white test effectively identifies anxiolytic-like or anxiogenic-like activity in mice by measuring their natural aversion to light and exploratory behavior. This quick and easy method aids in predicting the effects of potential anxiety-reducing drugs.

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Area of Science:

  • Neuroscience
  • Behavioral Pharmacology

Background:

  • Rodents exhibit innate aversion to bright light and spontaneous exploratory behavior.
  • The light/dark paradigm utilizes these behaviors, along with mild stressors like novel environments and light exposure, to assess anxiety-like responses.
  • The test apparatus comprises a dark compartment (one-third) and an illuminated compartment (two-thirds).

Purpose of the Study:

  • To evaluate the utility of the black and white test in predicting anxiolytic-like or anxiogenic-like activity in mice.
  • To understand the influence of factors like strain, weight, and age on test outcomes.
  • To explore the relationship between exploratory activity, time spent in compartments, and anxiolytic drug effects.

Main Methods:

  • Utilizing the light/dark (black and white) test apparatus with male mice.

Related Experiment Videos

  • Observing and quantifying animal transitions between compartments as an index of activity-exploration.
  • Measuring time spent in each compartment as a reflection of aversion.
  • Assessing the impact of anxiolytic compounds on these behavioral parameters.

    • Main Results:

    • The black and white test can differentiate between anxiolytic-like and anxiogenic-like activities in mice.
    • Transitions between compartments serve as an index of activity-exploration, influenced by habituation.
    • Time spent in each compartment reflects the animal's aversion to the illuminated area.
    • The efficacy of anxiolytic compounds is dependent on the baseline exploratory activity of the control group.

    Conclusions:

    • The black and white test is a valuable tool for predicting anxiolytic-like or anxiogenic-like effects of compounds in mice.
    • Classic anxiolytics (e.g., benzodiazepines) and newer anxiolytic-like drugs (e.g., serotonergic agents) can be detected using this paradigm.
    • The test is rapid, requires no prior animal training, and is easy to implement, making it suitable for various research settings.