The effects of prior experience with fighting and prior experience with both apomorphine and fighting were evaluated as possible sensitizing factors in rat intraspecific aggression induced by apomorphine. Results revealed that prior experience with the drug alone, or with fighting alone, had no effect on apomorphine-induced aggression. However, animals that had previously fought under the influence of apomorphine showed even higher levels of aggression suggesting that repeated experience with both the drug and fighting induces a type of sensitization.
The hypothesis is advanced that marihuana and espedaily Δ9-tetrahydrocannabinol, impair certain aspects of hippocampal neural functioning which are necessary for normal cognitive operations. It is suggested that many of the cognitive alterations induced by cannabinoids may be attributable to interference with cholinergic mechanisms. Both pharmacological and behavioral evidence are cited to support this hypothesis.
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