title: Avoidance conditioning: methods and problems.
mesh_terms: D000818:Animals; D001362:Avoidance Learning / Q000187:drug effects*; D003216:Conditioning, Operant / Q000187:drug effects; D004193:Discrimination Learning / Q000187:drug effects; D004353:Drug Evaluation, Preclinical / Q000379:methods; D008722:Methods; D013997:Time Factors