title: Defense system psychopharmacology: an ethological approach to the pharmacology of fear and anxiety.
abstract: Defensive behaviors comprise a set of flexible and adaptive responses to threatening situations and stimuli. In semi-natural situations affording a wide variety of responses, defensive behaviors change over time in response to information about the presence of danger, acquired through risk assessment activities. Two test batteries, a Fear/Defense Test Battery (F/DTB) measuring defensive behaviors to present, approaching predators, and an Anxiety/Defense Test Battery (A/DTB) measuring reactions to potential threat, have been used in conjunction with administration of potentially anxiolytic drugs. Results suggest that the F/DTB behaviors are not systematically responsive to anxiolytics. However, on the A/DTB, anxiolytic benzodiazepines produce a profile of effects primarily involving risk assessment activities. Very similar profiles of effect are seen also with some 5-HT1A compounds, alcohol, imipramine and MK-801, but not for a variety of additional compounds. A consistent pattern of gender differences are obtained with the A/DTB, with females more defensive than males. These results indicate that particular patterns of defensive behaviors may provide a very appropriate animal model for the analysis of pharmacological effects on anxiety.
authors.affiliation: Department of Psychology, University of Hawaii, Honolulu 96822.
authors.forename: R J
authors.initials: RJ
authors.lastname: Blanchard
authors.forename: E B
authors.initials: EB
authors.lastname: Yudko
authors.forename: R J
authors.initials: RJ
authors.lastname: Rodgers
authors.forename: D C
authors.initials: DC
authors.lastname: Blanchard
mesh_terms: D000818:Animals; D014151:Anti-Anxiety Agents / Q000494:pharmacology; D001007:Anxiety / Q000188:drug therapy / Q000523:psychology*; D001522:Behavior, Animal / Q000187:drug effects*; D005239:Fear / Q000187:drug effects*; D005260:Female; D008297:Male; D051381:Rats
chemical_list: D014151:Anti-Anxiety Agents