Abstract
Morphine, mescaline and cocaine have been tested in mice previously trained in a Y water, in two groups of parallel experiments. These involved, firstly (L Procedure), the consolidation of the innate tendency of the animals to direct towards the light, and secondly (D Procedure) the acquisition of a new behaviour, i.e. orientation toward the dark, opposite to the innate tendency. Both behaviour patterns were disrupted after the administration of morphine; following the administration of mescaline the reappearance of the innate tendency was evident, while innate behaviour was primarily affected by the administration of cocaine.
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