Psychopharmacology

, Volume 116, Issue 1, pp 56–64 | Cite as

Behavioural and pharmacological characterisation of the elevated “zero-maze” as an animal model of anxiety

  • Jon K. Shepherd
  • Savraj S. Grewal
  • Allan Fletcher
  • David J. Bill
  • Colin T. Dourish
Original Investigations

Abstract

The elevated “zero-maze” is a modification of the elevated plus-maze model of anxiety in rats which incorporates both traditional and novel ethological measures in the analysis of drug effects. The novel design comprises an elevated annular platform with two opposite enclosed quadrants and two open, removing any ambiguity in interpretation of time spent on the central square of the traditional design and allowing uninterrupted exploration. Using this model, the reference benzodiazepine anxiolytics, diazepam (0.125–0.5 mg/kg) and chlordiazepoxide (0.5–2.0 mg/kg) significantly increased the percentage of time spent in the open quadrants (% TO) and the frequency of head dips over the edge of the platform (HDIPS), and reduced the frequency of stretched attend postures (SAP) from the closed to open quadrants. In contrast, the anxiogenic drugm-chlorophenyl-piperazine (mCPP; 0.25–1.0 mg/kg) induced the opposite effects, decreasing %TO and HDIPS, and increasing SAP. The 5-HT1A receptor agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT; 0.001–0.1 mg/kg) had no effects on either %TO or HDIPS, but did decrease SAP at 0.01 mg/kg although not at higher or lower doses. Similarly, the 5-HT3 receptor antagonist, ondansetron (0.0001–1.0 mg/kg) decreased SAP and increased %TO at 0.01 mg/kg, but not at other doses. The present data suggest that a combination of the novel “zero-maze” design and a detailed ethological analysis provides a sensitive model for the detection of anxiolytic/anxiogenic drug action.

Key words

Anxiety Elevated zero-maze Rat Diazepam Chlordiazepoxide mCPP 8-OH-DPAT Ondansetron Head dips Stretched attend postures 

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Copyright information

© Springer-Verlag 1994

Authors and Affiliations

  • Jon K. Shepherd
    • 1
  • Savraj S. Grewal
    • 1
  • Allan Fletcher
    • 1
  • David J. Bill
    • 1
  • Colin T. Dourish
    • 1
  1. 1.Department of NeuropharmacologyWyeth Research (UK) LtdMaidenheadUK

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