[Effect of simultaneous administration of morphine and naloxone 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 simultaneous administration with morphine (1 mg/kg i.p.) and naloxone (0,05 mg/kg i.p.). Exploratory behaviour was evaluated using an automatic recording hole-board, that simultaneously registered the locomotor activity. Morphine and naloxone simultaneously administered produced, at the used doses, a significant statistic decrease in exploratory behaviour, while locomotor activity was unchanged, in comparison with drug-naive subjects. At the end, some possible interpretations are proposed about obtained results.