Abstract
Six groups of normally docile laboratory rats received morphine injections (to 600 mg/kg/day), placebo injections, or no injections under social or isolated conditions for 6 days. Postwithdrawal intragroup fighting was then monitored for 168 h by automated recording of loud vocalizations. Morphine-treated groups spontaneously began sustained (30 h) fighting 3 days after terminal injections, with greatest fighting observed in the group receiving the drug under social conditions.
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This work was supported in part by United States PHS Grant MH 17402-1
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Thor, D.H., Hoats, D.L. & Thor, C.J. Morphine induced fighting and prior social experience. Psychon Sci 18, 137–139 (1970). https://doi.org/10.3758/BF03332340
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DOI: https://doi.org/10.3758/BF03332340