[Effect of morphine on the exploratory behavior of mice]

The authors, after going carefully over the specific bibliography on the matter, report their results relating to exploratory behaviour in mice after administration of morphine (1 mg/kg i.p.). Exploratory behaviour was evaluated using an automatic recording hole-board, that simultaneously registered the locomotor activity. At the used doses, morphine did not produce variations either in exploratory behaviour or in locomotor activity of utilized mice, in comparison with drug-naive subjects. At the end, some possible interpretations are proposed about obtained results.